editors/sed.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * sed.c - very minimalist version of sed
   4  *
   5  * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
   6  * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
   7  * Copyright (C) 2002  Matt Kraai
   8  * Copyright (C) 2003 by Glenn McGrath
   9  * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
  10  *
  11  * MAINTAINER: Rob Landley <rob@landley.net>
  12  *
  13  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
  14  */
  15
  16 /* Code overview.
  17
  18   Files are laid out to avoid unnecessary function declarations.  So for
  19   example, every function add_cmd calls occurs before add_cmd in this file.
  20
  21   add_cmd() is called on each line of sed command text (from a file or from
  22   the command line).  It calls get_address() and parse_cmd_args().  The
  23   resulting sed_cmd_t structures are appended to a linked list
  24   (G.sed_cmd_head/G.sed_cmd_tail).
  25
  26   add_input_file() adds a FILE* to the list of input files.  We need to
  27   know all input sources ahead of time to find the last line for the $ match.
  28
  29   process_files() does actual sedding, reading data lines from each input FILE *
  30   (which could be stdin) and applying the sed command list (sed_cmd_head) to
  31   each of the resulting lines.
  32
  33   sed_main() is where external code calls into this, with a command line.
  34 */
  35
  36
  37 /*
  38         Supported features and commands in this version of sed:
  39
  40          - comments ('#')
  41          - address matching: num|/matchstr/[,num|/matchstr/|$]command
  42          - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
  43          - edit commands: (a)ppend, (i)nsert, (c)hange
  44          - file commands: (r)ead
  45          - backreferences in substitution expressions (\0, \1, \2...\9)
  46          - grouped commands: {cmd1;cmd2}
  47          - transliteration (y/source-chars/dest-chars/)
  48          - pattern space hold space storing / swapping (g, h, x)
  49          - labels / branching (: label, b, t, T)
  50
  51          (Note: Specifying an address (range) to match is *optional*; commands
  52          default to the whole pattern space if no specific address match was
  53          requested.)
  54
  55         Todo:
  56          - Create a wrapper around regex to make libc's regex conform with sed
  57
  58         Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
  59 */
  60
  61 #include "libbb.h"
  62 #include "xregex.h"
  63
  64 /* Each sed command turns into one of these structures. */
  65 typedef struct sed_cmd_s {
  66         /* Ordered by alignment requirements: currently 36 bytes on x86 */
  67         struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
  68
  69         /* address storage */
  70         regex_t *beg_match;     /* sed -e '/match/cmd' */
  71         regex_t *end_match;     /* sed -e '/match/,/end_match/cmd' */
  72         regex_t *sub_match;     /* For 's/sub_match/string/' */
  73         int beg_line;           /* 'sed 1p'   0 == apply commands to all lines */
  74         int end_line;           /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
  75
  76         FILE *sw_file;          /* File (sw) command writes to, -1 for none. */
  77         char *string;           /* Data string for (saicytb) commands. */
  78
  79         unsigned which_match;   /* (s) Which match to replace (0 for all) */
  80
  81         /* Bitfields (gcc won't group them if we don't) */
  82         unsigned invert:1;      /* the '!' after the address */
  83         unsigned in_match:1;    /* Next line also included in match? */
  84         unsigned sub_p:1;       /* (s) print option */
  85
  86         char sw_last_char;      /* Last line written by (sw) had no '\n' */
  87
  88         /* GENERAL FIELDS */
  89         char cmd;               /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
  90 } sed_cmd_t;
  91
  92 static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
  93
  94 struct globals {
  95         /* options */
  96         int be_quiet, regex_type;
  97         FILE *nonstdout;
  98         char *outname, *hold_space;
  99
 100         /* List of input files */
 101         int input_file_count, current_input_file;
 102         FILE **input_file_list;
 103
 104         regmatch_t regmatch[10];
 105         regex_t *previous_regex_ptr;
 106
 107         /* linked list of sed commands */
 108         sed_cmd_t sed_cmd_head, *sed_cmd_tail;
 109
 110         /* Linked list of append lines */
 111         llist_t *append_head;
 112
 113         char *add_cmd_line;
 114
 115         struct pipeline {
 116                 char *buf;      /* Space to hold string */
 117                 int idx;        /* Space used */
 118                 int len;        /* Space allocated */
 119         } pipeline;
 120 };
 121 #define G (*(struct globals*)&bb_common_bufsiz1)
 122 void BUG_sed_globals_too_big(void);
 123 #define INIT_G() do { \
 124         if (sizeof(struct globals) > COMMON_BUFSIZE) \
 125                 BUG_sed_globals_too_big(); \
 126         G.sed_cmd_tail = &G.sed_cmd_head; \
 127 } while (0)
 128
 129
 130 #if ENABLE_FEATURE_CLEAN_UP
 131 static void sed_free_and_close_stuff(void)
 132 {
 133         sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
 134
 135         llist_free(G.append_head, free);
 136
 137         while (sed_cmd) {
 138                 sed_cmd_t *sed_cmd_next = sed_cmd->next;
 139
 140                 if (sed_cmd->sw_file)
 141                         xprint_and_close_file(sed_cmd->sw_file);
 142
 143                 if (sed_cmd->beg_match) {
 144                         regfree(sed_cmd->beg_match);
 145                         free(sed_cmd->beg_match);
 146                 }
 147                 if (sed_cmd->end_match) {
 148                         regfree(sed_cmd->end_match);
 149                         free(sed_cmd->end_match);
 150                 }
 151                 if (sed_cmd->sub_match) {
 152                         regfree(sed_cmd->sub_match);
 153                         free(sed_cmd->sub_match);
 154                 }
 155                 free(sed_cmd->string);
 156                 free(sed_cmd);
 157                 sed_cmd = sed_cmd_next;
 158         }
 159
 160         free(G.hold_space);
 161
 162         while (G.current_input_file < G.input_file_count)
 163                 fclose(G.input_file_list[G.current_input_file++]);
 164 }
 165 #else
 166 void sed_free_and_close_stuff(void);
 167 #endif
 168
 169 /* If something bad happens during -i operation, delete temp file */
 170
 171 static void cleanup_outname(void)
 172 {
 173         if (G.outname) unlink(G.outname);
 174 }
 175
 176 /* strcpy, replacing "\from" with 'to'. If to is NUL, replacing "\any" with 'any' */
 177
 178 static void parse_escapes(char *dest, const char *string, int len, char from, char to)
 179 {
 180         int i = 0;
 181
 182         while (i < len) {
 183                 if (string[i] == '\\') {
 184                         if (!to || string[i+1] == from) {
 185                                 *dest++ = to ? to : string[i+1];
 186                                 i += 2;
 187                                 continue;
 188                         }
 189                         *dest++ = string[i++];
 190                 }
 191                 /* TODO: is it safe wrt a string with trailing '\\' ? */
 192                 *dest++ = string[i++];
 193         }
 194         *dest = '\0';
 195 }
 196
 197 static char *copy_parsing_escapes(const char *string, int len)
 198 {
 199         char *dest = xmalloc(len + 1);
 200
 201         parse_escapes(dest, string, len, 'n', '\n');
 202         /* GNU sed also recognizes \t */
 203         parse_escapes(dest, dest, strlen(dest), 't', '\t');
 204         return dest;
 205 }
 206
 207
 208 /*
 209  * index_of_next_unescaped_regexp_delim - walks left to right through a string
 210  * beginning at a specified index and returns the index of the next regular
 211  * expression delimiter (typically a forward slash ('/')) not preceded by
 212  * a backslash ('\').  A negative delimiter disables square bracket checking.
 213  */
 214 static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
 215 {
 216         int bracket = -1;
 217         int escaped = 0;
 218         int idx = 0;
 219         char ch;
 220
 221         if (delimiter < 0) {
 222                 bracket--;
 223                 delimiter = -delimiter;
 224         }
 225
 226         for (; (ch = str[idx]); idx++) {
 227                 if (bracket >= 0) {
 228                         if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
 229                                         && str[idx - 1] == '^')))
 230                                 bracket = -1;
 231                 } else if (escaped)
 232                         escaped = 0;
 233                 else if (ch == '\\')
 234                         escaped = 1;
 235                 else if (bracket == -1 && ch == '[')
 236                         bracket = idx;
 237                 else if (ch == delimiter)
 238                         return idx;
 239         }
 240
 241         /* if we make it to here, we've hit the end of the string */
 242         bb_error_msg_and_die("unmatched '%c'", delimiter);
 243 }
 244
 245 /*
 246  *  Returns the index of the third delimiter
 247  */
 248 static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
 249 {
 250         const char *cmdstr_ptr = cmdstr;
 251         char delimiter;
 252         int idx = 0;
 253
 254         /* verify that the 's' or 'y' is followed by something.  That something
 255          * (typically a 'slash') is now our regexp delimiter... */
 256         if (*cmdstr == '\0')
 257                 bb_error_msg_and_die("bad format in substitution expression");
 258         delimiter = *cmdstr_ptr++;
 259
 260         /* save the match string */
 261         idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
 262         *match = copy_parsing_escapes(cmdstr_ptr, idx);
 263
 264         /* save the replacement string */
 265         cmdstr_ptr += idx + 1;
 266         idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
 267         *replace = copy_parsing_escapes(cmdstr_ptr, idx);
 268
 269         return ((cmdstr_ptr - cmdstr) + idx);
 270 }
 271
 272 /*
 273  * returns the index in the string just past where the address ends.
 274  */
 275 static int get_address(const char *my_str, int *linenum, regex_t ** regex)
 276 {
 277         const char *pos = my_str;
 278
 279         if (isdigit(*my_str)) {
 280                 *linenum = strtol(my_str, (char**)&pos, 10);
 281                 /* endstr shouldnt ever equal NULL */
 282         } else if (*my_str == '$') {
 283                 *linenum = -1;
 284                 pos++;
 285         } else if (*my_str == '/' || *my_str == '\\') {
 286                 int next;
 287                 char delimiter;
 288                 char *temp;
 289
 290                 delimiter = '/';
 291                 if (*my_str == '\\') delimiter = *++pos;
 292                 next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
 293                 temp = copy_parsing_escapes(pos, next);
 294                 *regex = xmalloc(sizeof(regex_t));
 295                 xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
 296                 free(temp);
 297                 /* Move position to next character after last delimiter */
 298                 pos += (next+1);
 299         }
 300         return pos - my_str;
 301 }
 302
 303 /* Grab a filename.  Whitespace at start is skipped, then goes to EOL. */
 304 static int parse_file_cmd(/*sed_cmd_t *sed_cmd,*/ const char *filecmdstr, char **retval)
 305 {
 306         int start = 0, idx, hack = 0;
 307
 308         /* Skip whitespace, then grab filename to end of line */
 309         while (isspace(filecmdstr[start]))
 310                 start++;
 311         idx = start;
 312         while (filecmdstr[idx] && filecmdstr[idx] != '\n')
 313                 idx++;
 314
 315         /* If lines glued together, put backslash back. */
 316         if (filecmdstr[idx] == '\n')
 317                 hack = 1;
 318         if (idx == start)
 319                 bb_error_msg_and_die("empty filename");
 320         *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
 321         if (hack)
 322                 (*retval)[idx] = '\\';
 323
 324         return idx;
 325 }
 326
 327 static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
 328 {
 329         int cflags = G.regex_type;
 330         char *match;
 331         int idx;
 332
 333         /*
 334          * A substitution command should look something like this:
 335          *    s/match/replace/ #gIpw
 336          *    ||     |        |||
 337          *    mandatory       optional
 338          */
 339         idx = parse_regex_delim(substr, &match, &sed_cmd->string);
 340
 341         /* determine the number of back references in the match string */
 342         /* Note: we compute this here rather than in the do_subst_command()
 343          * function to save processor time, at the expense of a little more memory
 344          * (4 bits) per sed_cmd */
 345
 346         /* process the flags */
 347
 348         sed_cmd->which_match = 1;
 349         while (substr[++idx]) {
 350                 /* Parse match number */
 351                 if (isdigit(substr[idx])) {
 352                         if (match[0] != '^') {
 353                                 /* Match 0 treated as all, multiple matches we take the last one. */
 354                                 const char *pos = substr + idx;
 355 /* FIXME: error check? */
 356                                 sed_cmd->which_match = (unsigned)strtol(substr+idx, (char**) &pos, 10);
 357                                 idx = pos - substr;
 358                         }
 359                         continue;
 360                 }
 361                 /* Skip spaces */
 362                 if (isspace(substr[idx])) continue;
 363
 364                 switch (substr[idx]) {
 365                 /* Replace all occurrences */
 366                 case 'g':
 367                         if (match[0] != '^')
 368                                 sed_cmd->which_match = 0;
 369                         break;
 370                 /* Print pattern space */
 371                 case 'p':
 372                         sed_cmd->sub_p = 1;
 373                         break;
 374                 /* Write to file */
 375                 case 'w':
 376                 {
 377                         char *temp;
 378                         idx += parse_file_cmd(/*sed_cmd,*/ substr+idx, &temp);
 379                         break;
 380                 }
 381                 /* Ignore case (gnu exension) */
 382                 case 'I':
 383                         cflags |= REG_ICASE;
 384                         break;
 385                 /* Comment */
 386                 case '#':
 387                         while (substr[++idx]) /*skip all*/;
 388                         /* Fall through */
 389                 /* End of command */
 390                 case ';':
 391                 case '}':
 392                         goto out;
 393                 default:
 394                         bb_error_msg_and_die("bad option in substitution expression");
 395                 }
 396         }
 397 out:
 398         /* compile the match string into a regex */
 399         if (*match != '\0') {
 400                 /* If match is empty, we use last regex used at runtime */
 401                 sed_cmd->sub_match = xmalloc(sizeof(regex_t));
 402                 xregcomp(sed_cmd->sub_match, match, cflags);
 403         }
 404         free(match);
 405
 406         return idx;
 407 }
 408
 409 /*
 410  *  Process the commands arguments
 411  */
 412 static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
 413 {
 414         /* handle (s)ubstitution command */
 415         if (sed_cmd->cmd == 's')
 416                 cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
 417         /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
 418         else if (strchr("aic", sed_cmd->cmd)) {
 419                 if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
 420                         bb_error_msg_and_die
 421                                 ("only a beginning address can be specified for edit commands");
 422                 for (;;) {
 423                         if (*cmdstr == '\n' || *cmdstr == '\\') {
 424                                 cmdstr++;
 425                                 break;
 426                         } else if (isspace(*cmdstr))
 427                                 cmdstr++;
 428                         else
 429                                 break;
 430                 }
 431                 sed_cmd->string = xstrdup(cmdstr);
 432                 /* "\anychar" -> "anychar" */
 433                 parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
 434                 cmdstr += strlen(cmdstr);
 435         /* handle file cmds: (r)ead */
 436         } else if (strchr("rw", sed_cmd->cmd)) {
 437                 if (sed_cmd->end_line || sed_cmd->end_match)
 438                         bb_error_msg_and_die("command only uses one address");
 439                 cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
 440                 if (sed_cmd->cmd == 'w') {
 441                         sed_cmd->sw_file = xfopen_for_write(sed_cmd->string);
 442                         sed_cmd->sw_last_char = '\n';
 443                 }
 444         /* handle branch commands */
 445         } else if (strchr(":btT", sed_cmd->cmd)) {
 446                 int length;
 447
 448                 cmdstr = skip_whitespace(cmdstr);
 449                 length = strcspn(cmdstr, semicolon_whitespace);
 450                 if (length) {
 451                         sed_cmd->string = xstrndup(cmdstr, length);
 452                         cmdstr += length;
 453                 }
 454         }
 455         /* translation command */
 456         else if (sed_cmd->cmd == 'y') {
 457                 char *match, *replace;
 458                 int i = cmdstr[0];
 459
 460                 cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
 461                 /* \n already parsed, but \delimiter needs unescaping. */
 462                 parse_escapes(match, match, strlen(match), i, i);
 463                 parse_escapes(replace, replace, strlen(replace), i, i);
 464
 465                 sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
 466                 for (i = 0; match[i] && replace[i]; i++) {
 467                         sed_cmd->string[i*2] = match[i];
 468                         sed_cmd->string[i*2+1] = replace[i];
 469                 }
 470                 free(match);
 471                 free(replace);
 472         }
 473         /* if it wasnt a single-letter command that takes no arguments
 474          * then it must be an invalid command.
 475          */
 476         else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
 477                 bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
 478         }
 479
 480         /* give back whatever's left over */
 481         return cmdstr;
 482 }
 483
 484
 485 /* Parse address+command sets, skipping comment lines. */
 486
 487 static void add_cmd(const char *cmdstr)
 488 {
 489         sed_cmd_t *sed_cmd;
 490         int temp;
 491
 492         /* Append this line to any unfinished line from last time. */
 493         if (G.add_cmd_line) {
 494                 char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
 495                 free(G.add_cmd_line);
 496                 cmdstr = G.add_cmd_line = tp;
 497         }
 498
 499         /* If this line ends with backslash, request next line. */
 500         temp = strlen(cmdstr);
 501         if (temp && cmdstr[--temp] == '\\') {
 502                 if (!G.add_cmd_line)
 503                         G.add_cmd_line = xstrdup(cmdstr);
 504                 G.add_cmd_line[temp] = '\0';
 505                 return;
 506         }
 507
 508         /* Loop parsing all commands in this line. */
 509         while (*cmdstr) {
 510                 /* Skip leading whitespace and semicolons */
 511                 cmdstr += strspn(cmdstr, semicolon_whitespace);
 512
 513                 /* If no more commands, exit. */
 514                 if (!*cmdstr) break;
 515
 516                 /* if this is a comment, jump past it and keep going */
 517                 if (*cmdstr == '#') {
 518                         /* "#n" is the same as using -n on the command line */
 519                         if (cmdstr[1] == 'n')
 520                                 G.be_quiet++;
 521                         cmdstr = strpbrk(cmdstr, "\n\r");
 522                         if (!cmdstr) break;
 523                         continue;
 524                 }
 525
 526                 /* parse the command
 527                  * format is: [addr][,addr][!]cmd
 528                  *            |----||-----||-|
 529                  *            part1 part2  part3
 530                  */
 531
 532                 sed_cmd = xzalloc(sizeof(sed_cmd_t));
 533
 534                 /* first part (if present) is an address: either a '$', a number or a /regex/ */
 535                 cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
 536
 537                 /* second part (if present) will begin with a comma */
 538                 if (*cmdstr == ',') {
 539                         int idx;
 540
 541                         cmdstr++;
 542                         idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
 543                         if (!idx)
 544                                 bb_error_msg_and_die("no address after comma");
 545                         cmdstr += idx;
 546                 }
 547
 548                 /* skip whitespace before the command */
 549                 cmdstr = skip_whitespace(cmdstr);
 550
 551                 /* Check for inversion flag */
 552                 if (*cmdstr == '!') {
 553                         sed_cmd->invert = 1;
 554                         cmdstr++;
 555
 556                         /* skip whitespace before the command */
 557                         cmdstr = skip_whitespace(cmdstr);
 558                 }
 559
 560                 /* last part (mandatory) will be a command */
 561                 if (!*cmdstr)
 562                         bb_error_msg_and_die("missing command");
 563                 sed_cmd->cmd = *(cmdstr++);
 564                 cmdstr = parse_cmd_args(sed_cmd, cmdstr);
 565
 566                 /* Add the command to the command array */
 567                 G.sed_cmd_tail->next = sed_cmd;
 568                 G.sed_cmd_tail = G.sed_cmd_tail->next;
 569         }
 570
 571         /* If we glued multiple lines together, free the memory. */
 572         free(G.add_cmd_line);
 573         G.add_cmd_line = NULL;
 574 }
 575
 576 /* Append to a string, reallocating memory as necessary. */
 577
 578 #define PIPE_GROW 64
 579
 580 static void pipe_putc(char c)
 581 {
 582         if (G.pipeline.idx == G.pipeline.len) {
 583                 G.pipeline.buf = xrealloc(G.pipeline.buf,
 584                                 G.pipeline.len + PIPE_GROW);
 585                 G.pipeline.len += PIPE_GROW;
 586         }
 587         G.pipeline.buf[G.pipeline.idx++] = c;
 588 }
 589
 590 static void do_subst_w_backrefs(char *line, char *replace)
 591 {
 592         int i,j;
 593
 594         /* go through the replacement string */
 595         for (i = 0; replace[i]; i++) {
 596                 /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
 597                 if (replace[i] == '\\') {
 598                         unsigned backref = replace[++i] - '0';
 599                         if (backref <= 9) {
 600                                 /* print out the text held in G.regmatch[backref] */
 601                                 if (G.regmatch[backref].rm_so != -1) {
 602                                         j = G.regmatch[backref].rm_so;
 603                                         while (j < G.regmatch[backref].rm_eo)
 604                                                 pipe_putc(line[j++]);
 605                                 }
 606                                 continue;
 607                         }
 608                         /* I _think_ it is impossible to get '\' to be
 609                          * the last char in replace string. Thus we dont check
 610                          * for replace[i] == NUL. (counterexample anyone?) */
 611                         /* if we find a backslash escaped character, print the character */
 612                         pipe_putc(replace[i]);
 613                         continue;
 614                 }
 615                 /* if we find an unescaped '&' print out the whole matched text. */
 616                 if (replace[i] == '&') {
 617                         j = G.regmatch[0].rm_so;
 618                         while (j < G.regmatch[0].rm_eo)
 619                                 pipe_putc(line[j++]);
 620                         continue;
 621                 }
 622                 /* Otherwise just output the character. */
 623                 pipe_putc(replace[i]);
 624         }
 625 }
 626
 627 static int do_subst_command(sed_cmd_t *sed_cmd, char **line)
 628 {
 629         char *oldline = *line;
 630         int altered = 0;
 631         unsigned match_count = 0;
 632         regex_t *current_regex;
 633
 634         /* Handle empty regex. */
 635         if (sed_cmd->sub_match == NULL) {
 636                 current_regex = G.previous_regex_ptr;
 637                 if (!current_regex)
 638                         bb_error_msg_and_die("no previous regexp");
 639         } else
 640                 G.previous_regex_ptr = current_regex = sed_cmd->sub_match;
 641
 642         /* Find the first match */
 643         if (REG_NOMATCH == regexec(current_regex, oldline, 10, G.regmatch, 0))
 644                 return 0;
 645
 646         /* Initialize temporary output buffer. */
 647         G.pipeline.buf = xmalloc(PIPE_GROW);
 648         G.pipeline.len = PIPE_GROW;
 649         G.pipeline.idx = 0;
 650
 651         /* Now loop through, substituting for matches */
 652         do {
 653                 int i;
 654
 655                 /* Work around bug in glibc regexec, demonstrated by:
 656                    echo " a.b" | busybox sed 's [^ .]* x g'
 657                    The match_count check is so not to break
 658                    echo "hi" | busybox sed 's/^/!/g' */
 659                 if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
 660                         pipe_putc(*oldline++);
 661                         continue;
 662                 }
 663
 664                 match_count++;
 665
 666                 /* If we aren't interested in this match, output old line to
 667                    end of match and continue */
 668                 if (sed_cmd->which_match
 669                  && (sed_cmd->which_match != match_count)
 670                 ) {
 671                         for (i = 0; i < G.regmatch[0].rm_eo; i++)
 672                                 pipe_putc(*oldline++);
 673                         continue;
 674                 }
 675
 676                 /* print everything before the match */
 677                 for (i = 0; i < G.regmatch[0].rm_so; i++)
 678                         pipe_putc(oldline[i]);
 679
 680                 /* then print the substitution string */
 681                 do_subst_w_backrefs(oldline, sed_cmd->string);
 682
 683                 /* advance past the match */
 684                 oldline += G.regmatch[0].rm_eo;
 685                 /* flag that something has changed */
 686                 altered++;
 687
 688                 /* if we're not doing this globally, get out now */
 689                 if (sed_cmd->which_match)
 690                         break;
 691         } while (*oldline && (regexec(current_regex, oldline, 10, G.regmatch, 0) != REG_NOMATCH));
 692
 693         /* Copy rest of string into output pipeline */
 694
 695         while (*oldline)
 696                 pipe_putc(*oldline++);
 697         pipe_putc(0);
 698
 699         free(*line);
 700         *line = G.pipeline.buf;
 701         return altered;
 702 }
 703
 704 /* Set command pointer to point to this label.  (Does not handle null label.) */
 705 static sed_cmd_t *branch_to(char *label)
 706 {
 707         sed_cmd_t *sed_cmd;
 708
 709         for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
 710                 if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
 711                         return sed_cmd;
 712                 }
 713         }
 714         bb_error_msg_and_die("can't find label for jump to '%s'", label);
 715 }
 716
 717 static void append(char *s)
 718 {
 719         llist_add_to_end(&G.append_head, xstrdup(s));
 720 }
 721
 722 static void flush_append(void)
 723 {
 724         char *data;
 725
 726         /* Output appended lines. */
 727         while ((data = (char *)llist_pop(&G.append_head))) {
 728                 fprintf(G.nonstdout, "%s\n", data);
 729                 free(data);
 730         }
 731 }
 732
 733 static void add_input_file(FILE *file)
 734 {
 735         G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count);
 736         G.input_file_list[G.input_file_count++] = file;
 737 }
 738
 739 /* Get next line of input from G.input_file_list, flushing append buffer and
 740  * noting if we ran out of files without a newline on the last line we read.
 741  */
 742 enum {
 743         NO_EOL_CHAR = 1,
 744         LAST_IS_NUL = 2,
 745 };
 746 static char *get_next_line(char *gets_char)
 747 {
 748         char *temp = NULL;
 749         int len;
 750         char gc;
 751
 752         flush_append();
 753
 754         /* will be returned if last line in the file
 755          * doesn't end with either '\n' or '\0' */
 756         gc = NO_EOL_CHAR;
 757         while (G.current_input_file < G.input_file_count) {
 758                 FILE *fp = G.input_file_list[G.current_input_file];
 759                 /* Read line up to a newline or NUL byte, inclusive,
 760                  * return malloc'ed char[]. length of the chunk read
 761                  * is stored in len. NULL if EOF/error */
 762                 temp = bb_get_chunk_from_file(fp, &len);
 763                 if (temp) {
 764                         /* len > 0 here, it's ok to do temp[len-1] */
 765                         char c = temp[len-1];
 766                         if (c == '\n' || c == '\0') {
 767                                 temp[len-1] = '\0';
 768                                 gc = c;
 769                                 if (c == '\0') {
 770                                         int ch = fgetc(fp);
 771                                         if (ch != EOF)
 772                                                 ungetc(ch, fp);
 773                                         else
 774                                                 gc = LAST_IS_NUL;
 775                                 }
 776                         }
 777                         /* else we put NO_EOL_CHAR into *gets_char */
 778                         break;
 779
 780                 /* NB: I had the idea of peeking next file(s) and returning
 781                  * NO_EOL_CHAR only if it is the *last* non-empty
 782                  * input file. But there is a case where this won't work:
 783                  * file1: "a woo\nb woo"
 784                  * file2: "c no\nd no"
 785                  * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
 786                  * (note: *no* newline after "b bang"!) */
 787                 }
 788                 /* Close this file and advance to next one */
 789                 fclose(fp);
 790                 G.current_input_file++;
 791         }
 792         *gets_char = gc;
 793         return temp;
 794 }
 795
 796 /* Output line of text. */
 797 /* Note:
 798  * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
 799  * Without them, we had this:
 800  * echo -n thingy >z1
 801  * echo -n again >z2
 802  * >znull
 803  * sed "s/i/z/" z1 z2 znull | hexdump -vC
 804  * output:
 805  * gnu sed 4.1.5:
 806  * 00000000  74 68 7a 6e 67 79 0a 61  67 61 7a 6e              |thzngy.agazn|
 807  * bbox:
 808  * 00000000  74 68 7a 6e 67 79 61 67  61 7a 6e                 |thzngyagazn|
 809  */
 810 static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
 811 {
 812         char lpc = *last_puts_char;
 813
 814         /* Need to insert a '\n' between two files because first file's
 815          * last line wasn't terminated? */
 816         if (lpc != '\n' && lpc != '\0') {
 817                 fputc('\n', file);
 818                 lpc = '\n';
 819         }
 820         fputs(s, file);
 821
 822         /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
 823         if (s[0])
 824                 lpc = 'x';
 825
 826         /* had trailing '\0' and it was last char of file? */
 827         if (last_gets_char == LAST_IS_NUL) {
 828                 fputc('\0', file);
 829                 lpc = 'x'; /* */
 830         } else
 831         /* had trailing '\n' or '\0'? */
 832         if (last_gets_char != NO_EOL_CHAR) {
 833                 fputc(last_gets_char, file);
 834                 lpc = last_gets_char;
 835         }
 836
 837         if (ferror(file)) {
 838                 xfunc_error_retval = 4;  /* It's what gnu sed exits with... */
 839                 bb_error_msg_and_die(bb_msg_write_error);
 840         }
 841         *last_puts_char = lpc;
 842 }
 843
 844 #define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
 845
 846 static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
 847 {
 848         int retval = sed_cmd->beg_match && !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0);
 849         if (retval)
 850                 G.previous_regex_ptr = sed_cmd->beg_match;
 851         return retval;
 852 }
 853
 854 /* Process all the lines in all the files */
 855
 856 static void process_files(void)
 857 {
 858         char *pattern_space, *next_line;
 859         int linenum = 0;
 860         char last_puts_char = '\n';
 861         char last_gets_char, next_gets_char;
 862         sed_cmd_t *sed_cmd;
 863         int substituted;
 864
 865         /* Prime the pump */
 866         next_line = get_next_line(&next_gets_char);
 867
 868         /* go through every line in each file */
 869  again:
 870         substituted = 0;
 871
 872         /* Advance to next line.  Stop if out of lines. */
 873         pattern_space = next_line;
 874         if (!pattern_space) return;
 875         last_gets_char = next_gets_char;
 876
 877         /* Read one line in advance so we can act on the last line,
 878          * the '$' address */
 879         next_line = get_next_line(&next_gets_char);
 880         linenum++;
 881  restart:
 882         /* for every line, go through all the commands */
 883         for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
 884                 int old_matched, matched;
 885
 886                 old_matched = sed_cmd->in_match;
 887
 888                 /* Determine if this command matches this line: */
 889
 890                 /* Are we continuing a previous multi-line match? */
 891                 sed_cmd->in_match = sed_cmd->in_match
 892                         /* Or is no range necessary? */
 893                         || (!sed_cmd->beg_line && !sed_cmd->end_line
 894                                 && !sed_cmd->beg_match && !sed_cmd->end_match)
 895                         /* Or did we match the start of a numerical range? */
 896                         || (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum))
 897                         /* Or does this line match our begin address regex? */
 898                         || (beg_match(sed_cmd, pattern_space))
 899                         /* Or did we match last line of input? */
 900                         || (sed_cmd->beg_line == -1 && next_line == NULL);
 901
 902                 /* Snapshot the value */
 903
 904                 matched = sed_cmd->in_match;
 905
 906                 /* Is this line the end of the current match? */
 907
 908                 if (matched) {
 909                         sed_cmd->in_match = !(
 910                                 /* has the ending line come, or is this a single address command? */
 911                                 (sed_cmd->end_line ?
 912                                         sed_cmd->end_line == -1 ?
 913                                                 !next_line
 914                                                 : (sed_cmd->end_line <= linenum)
 915                                         : !sed_cmd->end_match
 916                                 )
 917                                 /* or does this line matches our last address regex */
 918                                 || (sed_cmd->end_match && old_matched
 919                                      && (regexec(sed_cmd->end_match,
 920                                                  pattern_space, 0, NULL, 0) == 0))
 921                         );
 922                 }
 923
 924                 /* Skip blocks of commands we didn't match. */
 925                 if (sed_cmd->cmd == '{') {
 926                         if (sed_cmd->invert ? matched : !matched) {
 927                                 while (sed_cmd->cmd != '}') {
 928                                         sed_cmd = sed_cmd->next;
 929                                         if (!sed_cmd)
 930                                                 bb_error_msg_and_die("unterminated {");
 931                                 }
 932                         }
 933                         continue;
 934                 }
 935
 936                 /* Okay, so did this line match? */
 937                 if (sed_cmd->invert ? !matched : matched) {
 938                         /* Update last used regex in case a blank substitute BRE is found */
 939                         if (sed_cmd->beg_match) {
 940                                 G.previous_regex_ptr = sed_cmd->beg_match;
 941                         }
 942
 943                         /* actual sedding */
 944                         switch (sed_cmd->cmd) {
 945
 946                         /* Print line number */
 947                         case '=':
 948                                 fprintf(G.nonstdout, "%d\n", linenum);
 949                                 break;
 950
 951                         /* Write the current pattern space up to the first newline */
 952                         case 'P':
 953                         {
 954                                 char *tmp = strchr(pattern_space, '\n');
 955
 956                                 if (tmp) {
 957                                         *tmp = '\0';
 958                                         /* TODO: explain why '\n' below */
 959                                         sed_puts(pattern_space, '\n');
 960                                         *tmp = '\n';
 961                                         break;
 962                                 }
 963                                 /* Fall Through */
 964                         }
 965
 966                         /* Write the current pattern space to output */
 967                         case 'p':
 968                                 /* NB: we print this _before_ the last line
 969                                  * (of current file) is printed. Even if
 970                                  * that line is nonterminated, we print
 971                                  * '\n' here (gnu sed does the same) */
 972                                 sed_puts(pattern_space, '\n');
 973                                 break;
 974                         /* Delete up through first newline */
 975                         case 'D':
 976                         {
 977                                 char *tmp = strchr(pattern_space, '\n');
 978
 979                                 if (tmp) {
 980                                         tmp = xstrdup(tmp+1);
 981                                         free(pattern_space);
 982                                         pattern_space = tmp;
 983                                         goto restart;
 984                                 }
 985                         }
 986                         /* discard this line. */
 987                         case 'd':
 988                                 goto discard_line;
 989
 990                         /* Substitute with regex */
 991                         case 's':
 992                                 if (!do_subst_command(sed_cmd, &pattern_space))
 993                                         break;
 994                                 substituted |= 1;
 995
 996                                 /* handle p option */
 997                                 if (sed_cmd->sub_p)
 998                                         sed_puts(pattern_space, last_gets_char);
 999                                 /* handle w option */
1000                                 if (sed_cmd->sw_file)
1001                                         puts_maybe_newline(
1002                                                 pattern_space, sed_cmd->sw_file,
1003                                                 &sed_cmd->sw_last_char, last_gets_char);
1004                                 break;
1005
1006                         /* Append line to linked list to be printed later */
1007                         case 'a':
1008                                 append(sed_cmd->string);
1009                                 break;
1010
1011                         /* Insert text before this line */
1012                         case 'i':
1013                                 sed_puts(sed_cmd->string, '\n');
1014                                 break;
1015
1016                         /* Cut and paste text (replace) */
1017                         case 'c':
1018                                 /* Only triggers on last line of a matching range. */
1019                                 if (!sed_cmd->in_match)
1020                                         sed_puts(sed_cmd->string, NO_EOL_CHAR);
1021                                 goto discard_line;
1022
1023                         /* Read file, append contents to output */
1024                         case 'r':
1025                         {
1026                                 FILE *rfile;
1027
1028                                 rfile = fopen_for_read(sed_cmd->string);
1029                                 if (rfile) {
1030                                         char *line;
1031
1032                                         while ((line = xmalloc_fgetline(rfile))
1033                                                         != NULL)
1034                                                 append(line);
1035                                         xprint_and_close_file(rfile);
1036                                 }
1037
1038                                 break;
1039                         }
1040
1041                         /* Write pattern space to file. */
1042                         case 'w':
1043                                 puts_maybe_newline(
1044                                         pattern_space, sed_cmd->sw_file,
1045                                         &sed_cmd->sw_last_char, last_gets_char);
1046                                 break;
1047
1048                         /* Read next line from input */
1049                         case 'n':
1050                                 if (!G.be_quiet)
1051                                         sed_puts(pattern_space, last_gets_char);
1052                                 if (next_line) {
1053                                         free(pattern_space);
1054                                         pattern_space = next_line;
1055                                         last_gets_char = next_gets_char;
1056                                         next_line = get_next_line(&next_gets_char);
1057                                         substituted = 0;
1058                                         linenum++;
1059                                         break;
1060                                 }
1061                                 /* fall through */
1062
1063                         /* Quit.  End of script, end of input. */
1064                         case 'q':
1065                                 /* Exit the outer while loop */
1066                                 free(next_line);
1067                                 next_line = NULL;
1068                                 goto discard_commands;
1069
1070                         /* Append the next line to the current line */
1071                         case 'N':
1072                         {
1073                                 int len;
1074                                 /* If no next line, jump to end of script and exit. */
1075                                 if (next_line == NULL) {
1076                                         /* Jump to end of script and exit */
1077                                         free(next_line);
1078                                         next_line = NULL;
1079                                         goto discard_line;
1080                                 /* append next_line, read new next_line. */
1081                                 }
1082                                 len = strlen(pattern_space);
1083                                 pattern_space = realloc(pattern_space, len + strlen(next_line) + 2);
1084                                 pattern_space[len] = '\n';
1085                                 strcpy(pattern_space + len+1, next_line);
1086                                 last_gets_char = next_gets_char;
1087                                 next_line = get_next_line(&next_gets_char);
1088                                 linenum++;
1089                                 break;
1090                         }
1091
1092                         /* Test/branch if substitution occurred */
1093                         case 't':
1094                                 if (!substituted) break;
1095                                 substituted = 0;
1096                                 /* Fall through */
1097                         /* Test/branch if substitution didn't occur */
1098                         case 'T':
1099                                 if (substituted) break;
1100                                 /* Fall through */
1101                         /* Branch to label */
1102                         case 'b':
1103                                 if (!sed_cmd->string) goto discard_commands;
1104                                 else sed_cmd = branch_to(sed_cmd->string);
1105                                 break;
1106                         /* Transliterate characters */
1107                         case 'y':
1108                         {
1109                                 int i, j;
1110
1111                                 for (i = 0; pattern_space[i]; i++) {
1112                                         for (j = 0; sed_cmd->string[j]; j += 2) {
1113                                                 if (pattern_space[i] == sed_cmd->string[j]) {
1114                                                         pattern_space[i] = sed_cmd->string[j + 1];
1115                                                         break;
1116                                                 }
1117                                         }
1118                                 }
1119
1120                                 break;
1121                         }
1122                         case 'g':       /* Replace pattern space with hold space */
1123                                 free(pattern_space);
1124                                 pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
1125                                 break;
1126                         case 'G':       /* Append newline and hold space to pattern space */
1127                         {
1128                                 int pattern_space_size = 2;
1129                                 int hold_space_size = 0;
1130
1131                                 if (pattern_space)
1132                                         pattern_space_size += strlen(pattern_space);
1133                                 if (G.hold_space)
1134                                         hold_space_size = strlen(G.hold_space);
1135                                 pattern_space = xrealloc(pattern_space,
1136                                                 pattern_space_size + hold_space_size);
1137                                 if (pattern_space_size == 2)
1138                                         pattern_space[0] = 0;
1139                                 strcat(pattern_space, "\n");
1140                                 if (G.hold_space)
1141                                         strcat(pattern_space, G.hold_space);
1142                                 last_gets_char = '\n';
1143
1144                                 break;
1145                         }
1146                         case 'h':       /* Replace hold space with pattern space */
1147                                 free(G.hold_space);
1148                                 G.hold_space = xstrdup(pattern_space);
1149                                 break;
1150                         case 'H':       /* Append newline and pattern space to hold space */
1151                         {
1152                                 int hold_space_size = 2;
1153                                 int pattern_space_size = 0;
1154
1155                                 if (G.hold_space)
1156                                         hold_space_size += strlen(G.hold_space);
1157                                 if (pattern_space)
1158                                         pattern_space_size = strlen(pattern_space);
1159                                 G.hold_space = xrealloc(G.hold_space,
1160                                                 hold_space_size + pattern_space_size);
1161
1162                                 if (hold_space_size == 2)
1163                                         *G.hold_space = 0;
1164                                 strcat(G.hold_space, "\n");
1165                                 if (pattern_space)
1166                                         strcat(G.hold_space, pattern_space);
1167
1168                                 break;
1169                         }
1170                         case 'x': /* Exchange hold and pattern space */
1171                         {
1172                                 char *tmp = pattern_space;
1173                                 pattern_space = G.hold_space ? : xzalloc(1);
1174                                 last_gets_char = '\n';
1175                                 G.hold_space = tmp;
1176                                 break;
1177                         }
1178                         }
1179                 }
1180         }
1181
1182         /*
1183          * exit point from sedding...
1184          */
1185  discard_commands:
1186         /* we will print the line unless we were told to be quiet ('-n')
1187            or if the line was suppressed (ala 'd'elete) */
1188         if (!G.be_quiet)
1189                 sed_puts(pattern_space, last_gets_char);
1190
1191         /* Delete and such jump here. */
1192  discard_line:
1193         flush_append();
1194         free(pattern_space);
1195
1196         goto again;
1197 }
1198
1199 /* It is possible to have a command line argument with embedded
1200  * newlines.  This counts as multiple command lines.
1201  * However, newline can be escaped: 's/e/z\<newline>z/'
1202  * We check for this.
1203  */
1204
1205 static void add_cmd_block(char *cmdstr)
1206 {
1207         char *sv, *eol;
1208
1209         cmdstr = sv = xstrdup(cmdstr);
1210         do {
1211                 eol = strchr(cmdstr, '\n');
1212  next:
1213                 if (eol) {
1214                         /* Count preceding slashes */
1215                         int slashes = 0;
1216                         char *sl = eol;
1217
1218                         while (sl != cmdstr && *--sl == '\\')
1219                                 slashes++;
1220                         /* Odd number of preceding slashes - newline is escaped */
1221                         if (slashes & 1) {
1222                                 overlapping_strcpy(eol - 1, eol);
1223                                 eol = strchr(eol, '\n');
1224                                 goto next;
1225                         }
1226                         *eol = '\0';
1227                 }
1228                 add_cmd(cmdstr);
1229                 cmdstr = eol + 1;
1230         } while (eol);
1231         free(sv);
1232 }
1233
1234 int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1235 int sed_main(int argc UNUSED_PARAM, char **argv)
1236 {
1237         enum {
1238                 OPT_in_place = 1 << 0,
1239         };
1240         unsigned opt;
1241         llist_t *opt_e, *opt_f;
1242         int status = EXIT_SUCCESS;
1243
1244         INIT_G();
1245
1246         /* destroy command strings on exit */
1247         if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
1248
1249         /* Lie to autoconf when it starts asking stupid questions. */
1250         if (argv[1] && !strcmp(argv[1], "--version")) {
1251                 puts("This is not GNU sed version 4.0");
1252                 return 0;
1253         }
1254
1255         /* do normal option parsing */
1256         opt_e = opt_f = NULL;
1257         opt_complementary = "e::f::" /* can occur multiple times */
1258                             "nn"; /* count -n */
1259         opt = getopt32(argv, "irne:f:", &opt_e, &opt_f,
1260                             &G.be_quiet); /* counter for -n */
1261         //argc -= optind;
1262         argv += optind;
1263         if (opt & OPT_in_place) { // -i
1264                 atexit(cleanup_outname);
1265         }
1266         if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
1267         //if (opt & 0x4) G.be_quiet++; // -n
1268         while (opt_e) { // -e
1269                 add_cmd_block(llist_pop(&opt_e));
1270         }
1271         while (opt_f) { // -f
1272                 char *line;
1273                 FILE *cmdfile;
1274                 cmdfile = xfopen_for_read(llist_pop(&opt_f));
1275                 while ((line = xmalloc_fgetline(cmdfile)) != NULL) {
1276                         add_cmd(line);
1277                         free(line);
1278                 }
1279                 fclose(cmdfile);
1280         }
1281         /* if we didn't get a pattern from -e or -f, use argv[0] */
1282         if (!(opt & 0x18)) {
1283                 if (!*argv)
1284                         bb_show_usage();
1285                 add_cmd_block(*argv++);
1286         }
1287         /* Flush any unfinished commands. */
1288         add_cmd("");
1289
1290         /* By default, we write to stdout */
1291         G.nonstdout = stdout;
1292
1293         /* argv[0..(argc-1)] should be names of file to process. If no
1294          * files were specified or '-' was specified, take input from stdin.
1295          * Otherwise, we process all the files specified. */
1296         if (argv[0] == NULL) {
1297                 if (opt & OPT_in_place)
1298                         bb_error_msg_and_die(bb_msg_requires_arg, "-i");
1299                 add_input_file(stdin);
1300                 process_files();
1301         } else {
1302                 int i;
1303                 FILE *file;
1304
1305                 for (i = 0; argv[i]; i++) {
1306                         struct stat statbuf;
1307                         int nonstdoutfd;
1308
1309                         if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
1310                                 add_input_file(stdin);
1311                                 process_files();
1312                                 continue;
1313                         }
1314                         file = fopen_or_warn(argv[i], "r");
1315                         if (!file) {
1316                                 status = EXIT_FAILURE;
1317                                 continue;
1318                         }
1319                         if (!(opt & OPT_in_place)) {
1320                                 add_input_file(file);
1321                                 continue;
1322                         }
1323
1324                         G.outname = xasprintf("%sXXXXXX", argv[i]);
1325                         nonstdoutfd = mkstemp(G.outname);
1326                         if (-1 == nonstdoutfd)
1327                                 bb_perror_msg_and_die("cannot create temp file %s", G.outname);
1328                         G.nonstdout = fdopen(nonstdoutfd, "w");
1329
1330                         /* Set permissions of output file */
1331
1332                         fstat(fileno(file), &statbuf);
1333                         fchmod(nonstdoutfd, statbuf.st_mode);
1334                         add_input_file(file);
1335                         process_files();
1336                         fclose(G.nonstdout);
1337
1338                         G.nonstdout = stdout;
1339                         /* unlink(argv[i]); */
1340                         xrename(G.outname, argv[i]);
1341                         free(G.outname);
1342                         G.outname = NULL;
1343                 }
1344                 if (G.input_file_count > G.current_input_file)
1345                         process_files();
1346         }
1347
1348         return status;
1349 }