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 <bug1@iinet.net.au>
   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 short 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[] = "; \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
 122 #define G (*(struct globals*)&bb_common_bufsiz1)
 123
 124 #if ENABLE_FEATURE_CLEAN_UP
 125 static void sed_free_and_close_stuff(void)
 126 {
 127         sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
 128
 129         llist_free(G.append_head, free);
 130
 131         while (sed_cmd) {
 132                 sed_cmd_t *sed_cmd_next = sed_cmd->next;
 133
 134                 if (sed_cmd->sw_file)
 135                         xprint_and_close_file(sed_cmd->sw_file);
 136
 137                 if (sed_cmd->beg_match) {
 138                         regfree(sed_cmd->beg_match);
 139                         free(sed_cmd->beg_match);
 140                 }
 141                 if (sed_cmd->end_match) {
 142                         regfree(sed_cmd->end_match);
 143                         free(sed_cmd->end_match);
 144                 }
 145                 if (sed_cmd->sub_match) {
 146                         regfree(sed_cmd->sub_match);
 147                         free(sed_cmd->sub_match);
 148                 }
 149                 free(sed_cmd->string);
 150                 free(sed_cmd);
 151                 sed_cmd = sed_cmd_next;
 152         }
 153
 154         if (G.hold_space) free(G.hold_space);
 155
 156         while (G.current_input_file < G.input_file_count)
 157                 fclose(G.input_file_list[G.current_input_file++]);
 158 }
 159 #else
 160 void sed_free_and_close_stuff(void);
 161 #endif
 162
 163 /* If something bad happens during -i operation, delete temp file */
 164
 165 static void cleanup_outname(void)
 166 {
 167         if (G.outname) unlink(G.outname);
 168 }
 169
 170 /* strdup, replacing "\n" with '\n', and "\delimiter" with 'delimiter' */
 171
 172 static void parse_escapes(char *dest, const char *string, int len, char from, char to)
 173 {
 174         int i = 0;
 175
 176         while (i < len) {
 177                 if (string[i] == '\\') {
 178                         if (!to || string[i+1] == from) {
 179                                 *dest++ = to ? to : string[i+1];
 180                                 i += 2;
 181                                 continue;
 182                         }
 183                         *dest++ = string[i++];
 184                 }
 185                 *dest++ = string[i++];
 186         }
 187         *dest = 0;
 188 }
 189
 190 static char *copy_parsing_escapes(const char *string, int len)
 191 {
 192         char *dest = xmalloc(len + 1);
 193
 194         parse_escapes(dest, string, len, 'n', '\n');
 195         return dest;
 196 }
 197
 198
 199 /*
 200  * index_of_next_unescaped_regexp_delim - walks left to right through a string
 201  * beginning at a specified index and returns the index of the next regular
 202  * expression delimiter (typically a forward * slash ('/')) not preceded by
 203  * a backslash ('\').  A negative delimiter disables square bracket checking.
 204  */
 205 static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
 206 {
 207         int bracket = -1;
 208         int escaped = 0;
 209         int idx = 0;
 210         char ch;
 211
 212         if (delimiter < 0) {
 213                 bracket--;
 214                 delimiter = -delimiter;
 215         }
 216
 217         for (; (ch = str[idx]); idx++) {
 218                 if (bracket >= 0) {
 219                         if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
 220                                         && str[idx - 1] == '^')))
 221                                 bracket = -1;
 222                 } else if (escaped)
 223                         escaped = 0;
 224                 else if (ch == '\\')
 225                         escaped = 1;
 226                 else if (bracket == -1 && ch == '[')
 227                         bracket = idx;
 228                 else if (ch == delimiter)
 229                         return idx;
 230         }
 231
 232         /* if we make it to here, we've hit the end of the string */
 233         bb_error_msg_and_die("unmatched '%c'", delimiter);
 234 }
 235
 236 /*
 237  *  Returns the index of the third delimiter
 238  */
 239 static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
 240 {
 241         const char *cmdstr_ptr = cmdstr;
 242         char delimiter;
 243         int idx = 0;
 244
 245         /* verify that the 's' or 'y' is followed by something.  That something
 246          * (typically a 'slash') is now our regexp delimiter... */
 247         if (*cmdstr == '\0')
 248                 bb_error_msg_and_die("bad format in substitution expression");
 249         delimiter = *cmdstr_ptr++;
 250
 251         /* save the match string */
 252         idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
 253         *match = copy_parsing_escapes(cmdstr_ptr, idx);
 254
 255         /* save the replacement string */
 256         cmdstr_ptr += idx + 1;
 257         idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
 258         *replace = copy_parsing_escapes(cmdstr_ptr, idx);
 259
 260         return ((cmdstr_ptr - cmdstr) + idx);
 261 }
 262
 263 /*
 264  * returns the index in the string just past where the address ends.
 265  */
 266 static int get_address(const char *my_str, int *linenum, regex_t ** regex)
 267 {
 268         const char *pos = my_str;
 269
 270         if (isdigit(*my_str)) {
 271                 *linenum = strtol(my_str, (char**)&pos, 10);
 272                 /* endstr shouldnt ever equal NULL */
 273         } else if (*my_str == '$') {
 274                 *linenum = -1;
 275                 pos++;
 276         } else if (*my_str == '/' || *my_str == '\\') {
 277                 int next;
 278                 char delimiter;
 279                 char *temp;
 280
 281                 delimiter = '/';
 282                 if (*my_str == '\\') delimiter = *++pos;
 283                 next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
 284                 temp = copy_parsing_escapes(pos, next);
 285                 *regex = xmalloc(sizeof(regex_t));
 286                 xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
 287                 free(temp);
 288                 /* Move position to next character after last delimiter */
 289                 pos += (next+1);
 290         }
 291         return pos - my_str;
 292 }
 293
 294 /* Grab a filename.  Whitespace at start is skipped, then goes to EOL. */
 295 static int parse_file_cmd(sed_cmd_t *sed_cmd, const char *filecmdstr, char **retval)
 296 {
 297         int start = 0, idx, hack = 0;
 298
 299         /* Skip whitespace, then grab filename to end of line */
 300         while (isspace(filecmdstr[start]))
 301                 start++;
 302         idx = start;
 303         while (filecmdstr[idx] && filecmdstr[idx] != '\n')
 304                 idx++;
 305
 306         /* If lines glued together, put backslash back. */
 307         if (filecmdstr[idx] == '\n')
 308                 hack = 1;
 309         if (idx == start)
 310                 bb_error_msg_and_die("empty filename");
 311         *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
 312         if (hack)
 313                 (*retval)[idx] = '\\';
 314
 315         return idx;
 316 }
 317
 318 static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
 319 {
 320         int cflags = G.regex_type;
 321         char *match;
 322         int idx;
 323
 324         /*
 325          * A substitution command should look something like this:
 326          *    s/match/replace/ #gIpw
 327          *    ||     |        |||
 328          *    mandatory       optional
 329          */
 330         idx = parse_regex_delim(substr, &match, &sed_cmd->string);
 331
 332         /* determine the number of back references in the match string */
 333         /* Note: we compute this here rather than in the do_subst_command()
 334          * function to save processor time, at the expense of a little more memory
 335          * (4 bits) per sed_cmd */
 336
 337         /* process the flags */
 338
 339         sed_cmd->which_match = 1;
 340         while (substr[++idx]) {
 341                 /* Parse match number */
 342                 if (isdigit(substr[idx])) {
 343                         if (match[0] != '^') {
 344                                 /* Match 0 treated as all, multiple matches we take the last one. */
 345                                 const char *pos = substr + idx;
 346 /* FIXME: error check? */
 347                                 sed_cmd->which_match = (unsigned short)strtol(substr+idx, (char**) &pos, 10);
 348                                 idx = pos - substr;
 349                         }
 350                         continue;
 351                 }
 352                 /* Skip spaces */
 353                 if (isspace(substr[idx])) continue;
 354
 355                 switch (substr[idx]) {
 356                 /* Replace all occurrences */
 357                 case 'g':
 358                         if (match[0] != '^') sed_cmd->which_match = 0;
 359                         break;
 360                 /* Print pattern space */
 361                 case 'p':
 362                         sed_cmd->sub_p = 1;
 363                         break;
 364                 /* Write to file */
 365                 case 'w':
 366                 {
 367                         char *temp;
 368                         idx += parse_file_cmd(sed_cmd, substr+idx, &temp);
 369                         break;
 370                 }
 371                 /* Ignore case (gnu exension) */
 372                 case 'I':
 373                         cflags |= REG_ICASE;
 374                         break;
 375                 /* Comment */
 376                 case '#':
 377                         while (substr[++idx]) /*skip all*/;
 378                         /* Fall through */
 379                 /* End of command */
 380                 case ';':
 381                 case '}':
 382                         goto out;
 383                 default:
 384                         bb_error_msg_and_die("bad option in substitution expression");
 385                 }
 386         }
 387 out:
 388         /* compile the match string into a regex */
 389         if (*match != '\0') {
 390                 /* If match is empty, we use last regex used at runtime */
 391                 sed_cmd->sub_match = xmalloc(sizeof(regex_t));
 392                 xregcomp(sed_cmd->sub_match, match, cflags);
 393         }
 394         free(match);
 395
 396         return idx;
 397 }
 398
 399 /*
 400  *  Process the commands arguments
 401  */
 402 static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
 403 {
 404         /* handle (s)ubstitution command */
 405         if (sed_cmd->cmd == 's')
 406                 cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
 407         /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
 408         else if (strchr("aic", sed_cmd->cmd)) {
 409                 if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
 410                         bb_error_msg_and_die
 411                                 ("only a beginning address can be specified for edit commands");
 412                 for (;;) {
 413                         if (*cmdstr == '\n' || *cmdstr == '\\') {
 414                                 cmdstr++;
 415                                 break;
 416                         } else if (isspace(*cmdstr))
 417                                 cmdstr++;
 418                         else
 419                                 break;
 420                 }
 421                 sed_cmd->string = xstrdup(cmdstr);
 422                 parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), 0, 0);
 423                 cmdstr += strlen(cmdstr);
 424         /* handle file cmds: (r)ead */
 425         } else if (strchr("rw", sed_cmd->cmd)) {
 426                 if (sed_cmd->end_line || sed_cmd->end_match)
 427                         bb_error_msg_and_die("command only uses one address");
 428                 cmdstr += parse_file_cmd(sed_cmd, cmdstr, &sed_cmd->string);
 429                 if (sed_cmd->cmd == 'w') {
 430                         sed_cmd->sw_file = xfopen(sed_cmd->string, "w");
 431                         sed_cmd->sw_last_char = '\n';
 432                 }
 433         /* handle branch commands */
 434         } else if (strchr(":btT", sed_cmd->cmd)) {
 435                 int length;
 436
 437                 cmdstr = skip_whitespace(cmdstr);
 438                 length = strcspn(cmdstr, semicolon_whitespace);
 439                 if (length) {
 440                         sed_cmd->string = xstrndup(cmdstr, length);
 441                         cmdstr += length;
 442                 }
 443         }
 444         /* translation command */
 445         else if (sed_cmd->cmd == 'y') {
 446                 char *match, *replace;
 447                 int i = cmdstr[0];
 448
 449                 cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
 450                 /* \n already parsed, but \delimiter needs unescaping. */
 451                 parse_escapes(match, match, strlen(match), i, i);
 452                 parse_escapes(replace, replace, strlen(replace), i, i);
 453
 454                 sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
 455                 for (i = 0; match[i] && replace[i]; i++) {
 456                         sed_cmd->string[i*2] = match[i];
 457                         sed_cmd->string[i*2+1] = replace[i];
 458                 }
 459                 free(match);
 460                 free(replace);
 461         }
 462         /* if it wasnt a single-letter command that takes no arguments
 463          * then it must be an invalid command.
 464          */
 465         else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
 466                 bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
 467         }
 468
 469         /* give back whatever's left over */
 470         return cmdstr;
 471 }
 472
 473
 474 /* Parse address+command sets, skipping comment lines. */
 475
 476 static void add_cmd(const char *cmdstr)
 477 {
 478         sed_cmd_t *sed_cmd;
 479         int temp;
 480
 481         /* Append this line to any unfinished line from last time. */
 482         if (G.add_cmd_line) {
 483                 char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
 484                 free(G.add_cmd_line);
 485                 cmdstr = G.add_cmd_line = tp;
 486         }
 487
 488         /* If this line ends with backslash, request next line. */
 489         temp = strlen(cmdstr);
 490         if (temp && cmdstr[--temp] == '\\') {
 491                 if (!G.add_cmd_line)
 492                         G.add_cmd_line = xstrdup(cmdstr);
 493                 G.add_cmd_line[temp] = '\0';
 494                 return;
 495         }
 496
 497         /* Loop parsing all commands in this line. */
 498         while (*cmdstr) {
 499                 /* Skip leading whitespace and semicolons */
 500                 cmdstr += strspn(cmdstr, semicolon_whitespace);
 501
 502                 /* If no more commands, exit. */
 503                 if (!*cmdstr) break;
 504
 505                 /* if this is a comment, jump past it and keep going */
 506                 if (*cmdstr == '#') {
 507                         /* "#n" is the same as using -n on the command line */
 508                         if (cmdstr[1] == 'n')
 509                                 G.be_quiet++;
 510                         cmdstr = strpbrk(cmdstr, "\n\r");
 511                         if (!cmdstr) break;
 512                         continue;
 513                 }
 514
 515                 /* parse the command
 516                  * format is: [addr][,addr][!]cmd
 517                  *            |----||-----||-|
 518                  *            part1 part2  part3
 519                  */
 520
 521                 sed_cmd = xzalloc(sizeof(sed_cmd_t));
 522
 523                 /* first part (if present) is an address: either a '$', a number or a /regex/ */
 524                 cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
 525
 526                 /* second part (if present) will begin with a comma */
 527                 if (*cmdstr == ',') {
 528                         int idx;
 529
 530                         cmdstr++;
 531                         idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
 532                         if (!idx)
 533                                 bb_error_msg_and_die("no address after comma");
 534                         cmdstr += idx;
 535                 }
 536
 537                 /* skip whitespace before the command */
 538                 cmdstr = skip_whitespace(cmdstr);
 539
 540                 /* Check for inversion flag */
 541                 if (*cmdstr == '!') {
 542                         sed_cmd->invert = 1;
 543                         cmdstr++;
 544
 545                         /* skip whitespace before the command */
 546                         cmdstr = skip_whitespace(cmdstr);
 547                 }
 548
 549                 /* last part (mandatory) will be a command */
 550                 if (!*cmdstr)
 551                         bb_error_msg_and_die("missing command");
 552                 sed_cmd->cmd = *(cmdstr++);
 553                 cmdstr = parse_cmd_args(sed_cmd, cmdstr);
 554
 555                 /* Add the command to the command array */
 556                 G.sed_cmd_tail->next = sed_cmd;
 557                 G.sed_cmd_tail = G.sed_cmd_tail->next;
 558         }
 559
 560         /* If we glued multiple lines together, free the memory. */
 561         free(G.add_cmd_line);
 562         G.add_cmd_line = NULL;
 563 }
 564
 565 /* Append to a string, reallocating memory as necessary. */
 566
 567 #define PIPE_GROW 64
 568
 569 static void pipe_putc(char c)
 570 {
 571         if (G.pipeline.idx == G.pipeline.len) {
 572                 G.pipeline.buf = xrealloc(G.pipeline.buf,
 573                                 G.pipeline.len + PIPE_GROW);
 574                 G.pipeline.len += PIPE_GROW;
 575         }
 576         G.pipeline.buf[G.pipeline.idx++] = c;
 577 }
 578
 579 static void do_subst_w_backrefs(char *line, char *replace)
 580 {
 581         int i,j;
 582
 583         /* go through the replacement string */
 584         for (i = 0; replace[i]; i++) {
 585                 /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
 586                 if (replace[i] == '\\') {
 587                         unsigned backref = replace[++i] - '0';
 588                         if (backref <= 9) {
 589                                 /* print out the text held in G.regmatch[backref] */
 590                                 if (G.regmatch[backref].rm_so != -1) {
 591                                         j = G.regmatch[backref].rm_so;
 592                                         while (j < G.regmatch[backref].rm_eo)
 593                                                 pipe_putc(line[j++]);
 594                                 }
 595                                 continue;
 596                         }
 597                         /* I _think_ it is impossible to get '\' to be
 598                          * the last char in replace string. Thus we dont check
 599                          * for replace[i] == NUL. (counterexample anyone?) */
 600                         /* if we find a backslash escaped character, print the character */
 601                         pipe_putc(replace[i]);
 602                         continue;
 603                 }
 604                 /* if we find an unescaped '&' print out the whole matched text. */
 605                 if (replace[i] == '&') {
 606                         j = G.regmatch[0].rm_so;
 607                         while (j < G.regmatch[0].rm_eo)
 608                                 pipe_putc(line[j++]);
 609                         continue;
 610                 }
 611                 /* Otherwise just output the character. */
 612                 pipe_putc(replace[i]);
 613         }
 614 }
 615
 616 static int do_subst_command(sed_cmd_t *sed_cmd, char **line)
 617 {
 618         char *oldline = *line;
 619         int altered = 0;
 620         int match_count = 0;
 621         regex_t *current_regex;
 622
 623         /* Handle empty regex. */
 624         if (sed_cmd->sub_match == NULL) {
 625                 current_regex = G.previous_regex_ptr;
 626                 if (!current_regex)
 627                         bb_error_msg_and_die("no previous regexp");
 628         } else
 629                 G.previous_regex_ptr = current_regex = sed_cmd->sub_match;
 630
 631         /* Find the first match */
 632         if (REG_NOMATCH == regexec(current_regex, oldline, 10, G.regmatch, 0))
 633                 return 0;
 634
 635         /* Initialize temporary output buffer. */
 636         G.pipeline.buf = xmalloc(PIPE_GROW);
 637         G.pipeline.len = PIPE_GROW;
 638         G.pipeline.idx = 0;
 639
 640         /* Now loop through, substituting for matches */
 641         do {
 642                 int i;
 643
 644                 /* Work around bug in glibc regexec, demonstrated by:
 645                    echo " a.b" | busybox sed 's [^ .]* x g'
 646                    The match_count check is so not to break
 647                    echo "hi" | busybox sed 's/^/!/g' */
 648                 if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
 649                         pipe_putc(*oldline++);
 650                         continue;
 651                 }
 652
 653                 match_count++;
 654
 655                 /* If we aren't interested in this match, output old line to
 656                    end of match and continue */
 657                 if (sed_cmd->which_match && sed_cmd->which_match != match_count) {
 658                         for (i = 0; i < G.regmatch[0].rm_eo; i++)
 659                                 pipe_putc(*oldline++);
 660                         continue;
 661                 }
 662
 663                 /* print everything before the match */
 664                 for (i = 0; i < G.regmatch[0].rm_so; i++)
 665                         pipe_putc(oldline[i]);
 666
 667                 /* then print the substitution string */
 668                 do_subst_w_backrefs(oldline, sed_cmd->string);
 669
 670                 /* advance past the match */
 671                 oldline += G.regmatch[0].rm_eo;
 672                 /* flag that something has changed */
 673                 altered++;
 674
 675                 /* if we're not doing this globally, get out now */
 676                 if (sed_cmd->which_match) break;
 677         } while (*oldline && (regexec(current_regex, oldline, 10, G.regmatch, 0) != REG_NOMATCH));
 678
 679         /* Copy rest of string into output pipeline */
 680
 681         while (*oldline)
 682                 pipe_putc(*oldline++);
 683         pipe_putc(0);
 684
 685         free(*line);
 686         *line = G.pipeline.buf;
 687         return altered;
 688 }
 689
 690 /* Set command pointer to point to this label.  (Does not handle null label.) */
 691 static sed_cmd_t *branch_to(char *label)
 692 {
 693         sed_cmd_t *sed_cmd;
 694
 695         for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
 696                 if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
 697                         return sed_cmd;
 698                 }
 699         }
 700         bb_error_msg_and_die("can't find label for jump to '%s'", label);
 701 }
 702
 703 static void append(char *s)
 704 {
 705         llist_add_to_end(&G.append_head, xstrdup(s));
 706 }
 707
 708 static void flush_append(void)
 709 {
 710         char *data;
 711
 712         /* Output appended lines. */
 713         while ((data = (char *)llist_pop(&G.append_head))) {
 714                 fprintf(G.nonstdout, "%s\n", data);
 715                 free(data);
 716         }
 717 }
 718
 719 static void add_input_file(FILE *file)
 720 {
 721         G.input_file_list = xrealloc(G.input_file_list,
 722                         (G.input_file_count + 1) * sizeof(FILE *));
 723         G.input_file_list[G.input_file_count++] = file;
 724 }
 725
 726 /* Get next line of input from G.input_file_list, flushing append buffer and
 727  * noting if we ran out of files without a newline on the last line we read.
 728  */
 729 enum {
 730         NO_EOL_CHAR = 1,
 731         LAST_IS_NUL = 2,
 732 };
 733 static char *get_next_line(char *gets_char)
 734 {
 735         char *temp = NULL;
 736         int len;
 737         char gc;
 738
 739         flush_append();
 740
 741         /* will be returned if last line in the file
 742          * doesn't end with either '\n' or '\0' */
 743         gc = NO_EOL_CHAR;
 744         while (G.current_input_file < G.input_file_count) {
 745                 FILE *fp = G.input_file_list[G.current_input_file];
 746                 /* Read line up to a newline or NUL byte, inclusive,
 747                  * return malloc'ed char[]. length of the chunk read
 748                  * is stored in len. NULL if EOF/error */
 749                 temp = bb_get_chunk_from_file(fp, &len);
 750                 if (temp) {
 751                         /* len > 0 here, it's ok to do temp[len-1] */
 752                         char c = temp[len-1];
 753                         if (c == '\n' || c == '\0') {
 754                                 temp[len-1] = '\0';
 755                                 gc = c;
 756                                 if (c == '\0') {
 757                                         int ch = fgetc(fp);
 758                                         if (ch != EOF)
 759                                                 ungetc(ch, fp);
 760                                         else
 761                                                 gc = LAST_IS_NUL;
 762                                 }
 763                         }
 764                         /* else we put NO_EOL_CHAR into *gets_char */
 765                         break;
 766
 767                 /* NB: I had the idea of peeking next file(s) and returning
 768                  * NO_EOL_CHAR only if it is the *last* non-empty
 769                  * input file. But there is a case where this won't work:
 770                  * file1: "a woo\nb woo"
 771                  * file2: "c no\nd no"
 772                  * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
 773                  * (note: *no* newline after "b bang"!) */
 774                 }
 775                 /* Close this file and advance to next one */
 776                 fclose(fp);
 777                 G.current_input_file++;
 778         }
 779         *gets_char = gc;
 780         return temp;
 781 }
 782
 783 /* Output line of text. */
 784 /* Note:
 785  * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
 786  * Without them, we had this:
 787  * echo -n thingy >z1
 788  * echo -n again >z2
 789  * >znull
 790  * sed "s/i/z/" z1 z2 znull | hexdump -vC
 791  * output:
 792  * gnu sed 4.1.5:
 793  * 00000000  74 68 7a 6e 67 79 0a 61  67 61 7a 6e              |thzngy.agazn|
 794  * bbox:
 795  * 00000000  74 68 7a 6e 67 79 61 67  61 7a 6e                 |thzngyagazn|
 796  */
 797 static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
 798 {
 799         char lpc = *last_puts_char;
 800
 801         /* Need to insert a '\n' between two files because first file's
 802          * last line wasn't terminated? */
 803         if (lpc != '\n' && lpc != '\0') {
 804                 fputc('\n', file);
 805                 lpc = '\n';
 806         }
 807         fputs(s, file);
 808
 809         /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
 810         if (s[0])
 811                 lpc = 'x';
 812
 813         /* had trailing '\0' and it was last char of file? */
 814         if (last_gets_char == LAST_IS_NUL) {
 815                 fputc('\0', file);
 816                 lpc = 'x'; /* */
 817         } else
 818         /* had trailing '\n' or '\0'? */
 819         if (last_gets_char != NO_EOL_CHAR) {
 820                 fputc(last_gets_char, file);
 821                 lpc = last_gets_char;
 822         }
 823
 824         if (ferror(file)) {
 825                 xfunc_error_retval = 4;  /* It's what gnu sed exits with... */
 826                 bb_error_msg_and_die(bb_msg_write_error);
 827         }
 828         *last_puts_char = lpc;
 829 }
 830
 831 #define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
 832
 833 /* Process all the lines in all the files */
 834
 835 static void process_files(void)
 836 {
 837         char *pattern_space, *next_line;
 838         int linenum = 0;
 839         char last_puts_char = '\n';
 840         char last_gets_char, next_gets_char;
 841         sed_cmd_t *sed_cmd;
 842         int substituted;
 843
 844         /* Prime the pump */
 845         next_line = get_next_line(&next_gets_char);
 846
 847         /* go through every line in each file */
 848 again:
 849         substituted = 0;
 850
 851         /* Advance to next line.  Stop if out of lines. */
 852         pattern_space = next_line;
 853         if (!pattern_space) return;
 854         last_gets_char = next_gets_char;
 855
 856         /* Read one line in advance so we can act on the last line,
 857          * the '$' address */
 858         next_line = get_next_line(&next_gets_char);
 859         linenum++;
 860 restart:
 861         /* for every line, go through all the commands */
 862         for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
 863                 int old_matched, matched;
 864
 865                 old_matched = sed_cmd->in_match;
 866
 867                 /* Determine if this command matches this line: */
 868
 869                 /* Are we continuing a previous multi-line match? */
 870                 sed_cmd->in_match = sed_cmd->in_match
 871                         /* Or is no range necessary? */
 872                         || (!sed_cmd->beg_line && !sed_cmd->end_line
 873                                 && !sed_cmd->beg_match && !sed_cmd->end_match)
 874                         /* Or did we match the start of a numerical range? */
 875                         || (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum))
 876                         /* Or does this line match our begin address regex? */
 877                         || (sed_cmd->beg_match &&
 878                             !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0))
 879                         /* Or did we match last line of input? */
 880                         || (sed_cmd->beg_line == -1 && next_line == NULL);
 881
 882                 /* Snapshot the value */
 883
 884                 matched = sed_cmd->in_match;
 885
 886                 /* Is this line the end of the current match? */
 887
 888                 if (matched) {
 889                         sed_cmd->in_match = !(
 890                                 /* has the ending line come, or is this a single address command? */
 891                                 (sed_cmd->end_line ?
 892                                         sed_cmd->end_line == -1 ?
 893                                                 !next_line
 894                                                 : (sed_cmd->end_line <= linenum)
 895                                         : !sed_cmd->end_match
 896                                 )
 897                                 /* or does this line matches our last address regex */
 898                                 || (sed_cmd->end_match && old_matched
 899                                      && (regexec(sed_cmd->end_match,
 900                                                  pattern_space, 0, NULL, 0) == 0))
 901                         );
 902                 }
 903
 904                 /* Skip blocks of commands we didn't match. */
 905                 if (sed_cmd->cmd == '{') {
 906                         if (sed_cmd->invert ? matched : !matched) {
 907                                 while (sed_cmd->cmd != '}') {
 908                                         sed_cmd = sed_cmd->next;
 909                                         if (!sed_cmd)
 910                                                 bb_error_msg_and_die("unterminated {");
 911                                 }
 912                         }
 913                         continue;
 914                 }
 915
 916                 /* Okay, so did this line match? */
 917                 if (sed_cmd->invert ? !matched : matched) {
 918                         /* Update last used regex in case a blank substitute BRE is found */
 919                         if (sed_cmd->beg_match) {
 920                                 G.previous_regex_ptr = sed_cmd->beg_match;
 921                         }
 922
 923                         /* actual sedding */
 924                         switch (sed_cmd->cmd) {
 925
 926                         /* Print line number */
 927                         case '=':
 928                                 fprintf(G.nonstdout, "%d\n", linenum);
 929                                 break;
 930
 931                         /* Write the current pattern space up to the first newline */
 932                         case 'P':
 933                         {
 934                                 char *tmp = strchr(pattern_space, '\n');
 935
 936                                 if (tmp) {
 937                                         *tmp = '\0';
 938                                         /* TODO: explain why '\n' below */
 939                                         sed_puts(pattern_space, '\n');
 940                                         *tmp = '\n';
 941                                         break;
 942                                 }
 943                                 /* Fall Through */
 944                         }
 945
 946                         /* Write the current pattern space to output */
 947                         case 'p':
 948                                 /* NB: we print this _before_ the last line
 949                                  * (of current file) is printed. Even if
 950                                  * that line is nonterminated, we print
 951                                  * '\n' here (gnu sed does the same) */
 952                                 sed_puts(pattern_space, '\n');
 953                                 break;
 954                         /* Delete up through first newline */
 955                         case 'D':
 956                         {
 957                                 char *tmp = strchr(pattern_space, '\n');
 958
 959                                 if (tmp) {
 960                                         tmp = xstrdup(tmp+1);
 961                                         free(pattern_space);
 962                                         pattern_space = tmp;
 963                                         goto restart;
 964                                 }
 965                         }
 966                         /* discard this line. */
 967                         case 'd':
 968                                 goto discard_line;
 969
 970                         /* Substitute with regex */
 971                         case 's':
 972                                 if (!do_subst_command(sed_cmd, &pattern_space))
 973                                         break;
 974                                 substituted |= 1;
 975
 976                                 /* handle p option */
 977                                 if (sed_cmd->sub_p)
 978                                         sed_puts(pattern_space, last_gets_char);
 979                                 /* handle w option */
 980                                 if (sed_cmd->sw_file)
 981                                         puts_maybe_newline(
 982                                                 pattern_space, sed_cmd->sw_file,
 983                                                 &sed_cmd->sw_last_char, last_gets_char);
 984                                 break;
 985
 986                         /* Append line to linked list to be printed later */
 987                         case 'a':
 988                                 append(sed_cmd->string);
 989                                 break;
 990
 991                         /* Insert text before this line */
 992                         case 'i':
 993                                 sed_puts(sed_cmd->string, '\n');
 994                                 break;
 995
 996                         /* Cut and paste text (replace) */
 997                         case 'c':
 998                                 /* Only triggers on last line of a matching range. */
 999                                 if (!sed_cmd->in_match)
1000                                         sed_puts(sed_cmd->string, NO_EOL_CHAR);
1001                                 goto discard_line;
1002
1003                         /* Read file, append contents to output */
1004                         case 'r':
1005                         {
1006                                 FILE *rfile;
1007
1008                                 rfile = fopen(sed_cmd->string, "r");
1009                                 if (rfile) {
1010                                         char *line;
1011
1012                                         while ((line = xmalloc_getline(rfile))
1013                                                         != NULL)
1014                                                 append(line);
1015                                         xprint_and_close_file(rfile);
1016                                 }
1017
1018                                 break;
1019                         }
1020
1021                         /* Write pattern space to file. */
1022                         case 'w':
1023                                 puts_maybe_newline(
1024                                         pattern_space, sed_cmd->sw_file,
1025                                         &sed_cmd->sw_last_char, last_gets_char);
1026                                 break;
1027
1028                         /* Read next line from input */
1029                         case 'n':
1030                                 if (!G.be_quiet)
1031                                         sed_puts(pattern_space, last_gets_char);
1032                                 if (next_line) {
1033                                         free(pattern_space);
1034                                         pattern_space = next_line;
1035                                         last_gets_char = next_gets_char;
1036                                         next_line = get_next_line(&next_gets_char);
1037                                         linenum++;
1038                                         break;
1039                                 }
1040                                 /* fall through */
1041
1042                         /* Quit.  End of script, end of input. */
1043                         case 'q':
1044                                 /* Exit the outer while loop */
1045                                 free(next_line);
1046                                 next_line = NULL;
1047                                 goto discard_commands;
1048
1049                         /* Append the next line to the current line */
1050                         case 'N':
1051                         {
1052                                 int len;
1053                                 /* If no next line, jump to end of script and exit. */
1054                                 if (next_line == NULL) {
1055                                         /* Jump to end of script and exit */
1056                                         free(next_line);
1057                                         next_line = NULL;
1058                                         goto discard_line;
1059                                 /* append next_line, read new next_line. */
1060                                 }
1061                                 len = strlen(pattern_space);
1062                                 pattern_space = realloc(pattern_space, len + strlen(next_line) + 2);
1063                                 pattern_space[len] = '\n';
1064                                 strcpy(pattern_space + len+1, next_line);
1065                                 last_gets_char = next_gets_char;
1066                                 next_line = get_next_line(&next_gets_char);
1067                                 linenum++;
1068                                 break;
1069                         }
1070
1071                         /* Test/branch if substitution occurred */
1072                         case 't':
1073                                 if (!substituted) break;
1074                                 substituted = 0;
1075                                 /* Fall through */
1076                         /* Test/branch if substitution didn't occur */
1077                         case 'T':
1078                                 if (substituted) break;
1079                                 /* Fall through */
1080                         /* Branch to label */
1081                         case 'b':
1082                                 if (!sed_cmd->string) goto discard_commands;
1083                                 else sed_cmd = branch_to(sed_cmd->string);
1084                                 break;
1085                         /* Transliterate characters */
1086                         case 'y':
1087                         {
1088                                 int i, j;
1089
1090                                 for (i = 0; pattern_space[i]; i++) {
1091                                         for (j = 0; sed_cmd->string[j]; j += 2) {
1092                                                 if (pattern_space[i] == sed_cmd->string[j]) {
1093                                                         pattern_space[i] = sed_cmd->string[j + 1];
1094                                                         break;
1095                                                 }
1096                                         }
1097                                 }
1098
1099                                 break;
1100                         }
1101                         case 'g':       /* Replace pattern space with hold space */
1102                                 free(pattern_space);
1103                                 pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
1104                                 break;
1105                         case 'G':       /* Append newline and hold space to pattern space */
1106                         {
1107                                 int pattern_space_size = 2;
1108                                 int hold_space_size = 0;
1109
1110                                 if (pattern_space)
1111                                         pattern_space_size += strlen(pattern_space);
1112                                 if (G.hold_space)
1113                                         hold_space_size = strlen(G.hold_space);
1114                                 pattern_space = xrealloc(pattern_space,
1115                                                 pattern_space_size + hold_space_size);
1116                                 if (pattern_space_size == 2)
1117                                         pattern_space[0] = 0;
1118                                 strcat(pattern_space, "\n");
1119                                 if (G.hold_space)
1120                                         strcat(pattern_space, G.hold_space);
1121                                 last_gets_char = '\n';
1122
1123                                 break;
1124                         }
1125                         case 'h':       /* Replace hold space with pattern space */
1126                                 free(G.hold_space);
1127                                 G.hold_space = xstrdup(pattern_space);
1128                                 break;
1129                         case 'H':       /* Append newline and pattern space to hold space */
1130                         {
1131                                 int hold_space_size = 2;
1132                                 int pattern_space_size = 0;
1133
1134                                 if (G.hold_space)
1135                                         hold_space_size += strlen(G.hold_space);
1136                                 if (pattern_space)
1137                                         pattern_space_size = strlen(pattern_space);
1138                                 G.hold_space = xrealloc(G.hold_space,
1139                                                 hold_space_size + pattern_space_size);
1140
1141                                 if (hold_space_size == 2)
1142                                         *G.hold_space = 0;
1143                                 strcat(G.hold_space, "\n");
1144                                 if (pattern_space)
1145                                         strcat(G.hold_space, pattern_space);
1146
1147                                 break;
1148                         }
1149                         case 'x': /* Exchange hold and pattern space */
1150                         {
1151                                 char *tmp = pattern_space;
1152                                 pattern_space = G.hold_space ? : xzalloc(1);
1153                                 last_gets_char = '\n';
1154                                 G.hold_space = tmp;
1155                                 break;
1156                         }
1157                         }
1158                 }
1159         }
1160
1161         /*
1162          * exit point from sedding...
1163          */
1164  discard_commands:
1165         /* we will print the line unless we were told to be quiet ('-n')
1166            or if the line was suppressed (ala 'd'elete) */
1167         if (!G.be_quiet)
1168                 sed_puts(pattern_space, last_gets_char);
1169
1170         /* Delete and such jump here. */
1171  discard_line:
1172         flush_append();
1173         free(pattern_space);
1174
1175         goto again;
1176 }
1177
1178 /* It is possible to have a command line argument with embedded
1179  * newlines.  This counts as multiple command lines.
1180  * However, newline can be escaped: 's/e/z\<newline>z/'
1181  * We check for this.
1182  */
1183
1184 static void add_cmd_block(char *cmdstr)
1185 {
1186         char *sv, *eol;
1187
1188         cmdstr = sv = xstrdup(cmdstr);
1189         do {
1190                 eol = strchr(cmdstr, '\n');
1191  next:
1192                 if (eol) {
1193                         /* Count preceding slashes */
1194                         int slashes = 0;
1195                         char *sl = eol;
1196
1197                         while (sl != cmdstr && *--sl == '\\')
1198                                 slashes++;
1199                         /* Odd number of preceding slashes - newline is escaped */
1200                         if (slashes & 1) {
1201                                 strcpy(eol-1, eol);
1202                                 eol = strchr(eol, '\n');
1203                                 goto next;
1204                         }
1205                         *eol = '\0';
1206                 }
1207                 add_cmd(cmdstr);
1208                 cmdstr = eol + 1;
1209         } while (eol);
1210         free(sv);
1211 }
1212
1213 void BUG_sed_globals_too_big(void);
1214
1215 int sed_main(int argc, char **argv);
1216 int sed_main(int argc, char **argv)
1217 {
1218         enum {
1219                 OPT_in_place = 1 << 0,
1220         };
1221         unsigned opt;
1222         llist_t *opt_e, *opt_f;
1223         int status = EXIT_SUCCESS;
1224
1225         if (sizeof(struct globals) > sizeof(bb_common_bufsiz1))
1226                 BUG_sed_globals_too_big();
1227
1228         G.sed_cmd_tail = &G.sed_cmd_head;
1229
1230         /* destroy command strings on exit */
1231         if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
1232
1233         /* Lie to autoconf when it starts asking stupid questions. */
1234         if (argc == 2 && !strcmp(argv[1], "--version")) {
1235                 puts("This is not GNU sed version 4.0");
1236                 return 0;
1237         }
1238
1239         /* do normal option parsing */
1240         opt_e = opt_f = NULL;
1241         opt_complementary = "e::f::" /* can occur multiple times */
1242                             "nn"; /* count -n */
1243         opt = getopt32(argc, argv, "irne:f:", &opt_e, &opt_f,
1244                             &G.be_quiet); /* counter for -n */
1245         argc -= optind;
1246         argv += optind;
1247         if (opt & OPT_in_place) { // -i
1248                 atexit(cleanup_outname);
1249         }
1250         if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
1251         //if (opt & 0x4) G.be_quiet++; // -n
1252         while (opt_e) { // -e
1253                 add_cmd_block(opt_e->data);
1254                 opt_e = opt_e->link;
1255                 /* we leak opt_e here... */
1256         }
1257         while (opt_f) { // -f
1258                 char *line;
1259                 FILE *cmdfile;
1260                 cmdfile = xfopen(opt_f->data, "r");
1261                 while ((line = xmalloc_getline(cmdfile)) != NULL) {
1262                         add_cmd(line);
1263                         free(line);
1264                 }
1265                 fclose(cmdfile);
1266                 opt_f = opt_f->link;
1267                 /* we leak opt_f here... */
1268         }
1269         /* if we didn't get a pattern from -e or -f, use argv[0] */
1270         if (!(opt & 0x18)) {
1271                 if (!argc)
1272                         bb_show_usage();
1273                 add_cmd_block(*argv++);
1274                 argc--;
1275         }
1276         /* Flush any unfinished commands. */
1277         add_cmd("");
1278
1279         /* By default, we write to stdout */
1280         G.nonstdout = stdout;
1281
1282         /* argv[0..(argc-1)] should be names of file to process. If no
1283          * files were specified or '-' was specified, take input from stdin.
1284          * Otherwise, we process all the files specified. */
1285         if (argv[0] == NULL) {
1286                 if (opt & OPT_in_place)
1287                         bb_error_msg_and_die(bb_msg_requires_arg, "-i");
1288                 add_input_file(stdin);
1289                 process_files();
1290         } else {
1291                 int i;
1292                 FILE *file;
1293
1294                 for (i = 0; i < argc; i++) {
1295                         struct stat statbuf;
1296                         int nonstdoutfd;
1297
1298                         if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
1299                                 add_input_file(stdin);
1300                                 process_files();
1301                                 continue;
1302                         }
1303                         file = fopen_or_warn(argv[i], "r");
1304                         if (!file) {
1305                                 status = EXIT_FAILURE;
1306                                 continue;
1307                         }
1308                         if (!(opt & OPT_in_place)) {
1309                                 add_input_file(file);
1310                                 continue;
1311                         }
1312
1313                         G.outname = xasprintf("%sXXXXXX", argv[i]);
1314                         nonstdoutfd = mkstemp(G.outname);
1315                         if (-1 == nonstdoutfd)
1316                                 bb_perror_msg_and_die("cannot create temp file %s", G.outname);
1317                         G.nonstdout = fdopen(nonstdoutfd, "w");
1318
1319                         /* Set permissions of output file */
1320
1321                         fstat(fileno(file), &statbuf);
1322                         fchmod(nonstdoutfd, statbuf.st_mode);
1323                         add_input_file(file);
1324                         process_files();
1325                         fclose(G.nonstdout);
1326
1327                         G.nonstdout = stdout;
1328                         /* unlink(argv[i]); */
1329                         // FIXME: error check / message?
1330                         rename(G.outname, argv[i]);
1331                         free(G.outname);
1332                         G.outname = 0;
1333                 }
1334                 if (G.input_file_count > G.current_input_file)
1335                         process_files();
1336         }
1337
1338         return status;
1339 }