X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=editors%2Fsed.c;h=5fc3a14a5f9ae6bd35756fcdf102692b17ebf571;hb=7940147e2516b7042cff956acb98aca39007fdb8;hp=0d57a4a06e765ceb37dc17c820b847390d81c713;hpb=61677feff7f549a48267c2c0c50a7420de6e2599;p=oweals%2Fbusybox.git diff --git a/editors/sed.c b/editors/sed.c index 0d57a4a06..5fc3a14a5 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -1,15 +1,9 @@ -/* vi: set sw=4 ts=4: */ /* - * Mini sed implementation for busybox + * sed.c - very minimalist version of sed * - * - * Copyright (C) 1999,2000 by Lineo, inc. - * Written by Erik Andersen , - * - * Modifications for addresses and append command have been - * written by Marco Pantaleoni , - * and are: - * Copyright (C) 1999 Marco Pantaleoni. + * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley + * Copyright (C) 1999,2000,2001 by Mark Whitley + * Copyright (C) 2002 Matt Kraai * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -27,330 +21,855 @@ * */ -#include "internal.h" -#include "regexp.h" +/* + Supported features and commands in this version of sed: + + - comments ('#') + - address matching: num|/matchstr/[,num|/matchstr/|$]command + - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags) + - edit commands: (a)ppend, (i)nsert, (c)hange + - file commands: (r)ead + - backreferences in substitution expressions (\1, \2...\9) + + (Note: Specifying an address (range) to match is *optional*; commands + default to the whole pattern space if no specific address match was + requested.) + + Unsupported features: + + - transliteration (y/source-chars/dest-chars/) (use 'tr') + - no pattern space hold space storing / swapping (x, etc.) + - no labels / branching (: label, b, t, and friends) + - and lots, lots more. +*/ + #include -#include +#include /* for getopt() */ +#include +#include /* for strdup() */ #include -#include -#include -#include -#include - -static const char sed_usage[] = - "sed [-n] -e script [file...]\n\n" - "Allowed sed scripts come in the following form:\n" - "\t'ADDR [!] COMMAND'\n\n" - "\twhere address ADDR can be:\n" - "\t NUMBER Match specified line number\n" - "\t $ Match last line\n" - "\t /REGEXP/ Match specified regexp\n" - "\t (! inverts the meaning of the match)\n\n" - "\tand COMMAND can be:\n" - "\t s/regexp/replacement/[igp]\n" - "\t which attempt to match regexp against the pattern space\n" - "\t and if successful replaces the matched portion with replacement.\n\n" - "\t aTEXT\n" - "\t which appends TEXT after the pattern space\n" - "Options:\n" - "-e\tadd the script to the commands to be executed\n" - "-n\tsuppress automatic printing of pattern space\n\n" -#if defined BB_REGEXP - "This version of sed matches full regular expresions.\n"; -#else - "This version of sed matches strings (not full regular expresions).\n"; -#endif +#include /* for isspace() */ +#include +#include "busybox.h" + +/* externs */ +extern void xregcomp(regex_t *preg, const char *regex, int cflags); +extern int optind; /* in unistd.h */ +extern char *optarg; /* ditto */ + +/* options */ +static int be_quiet = 0; + + +struct sed_cmd { + /* Order by alignment requirements */ + + /* address storage */ + regex_t *beg_match; /* sed -e '/match/cmd' */ + regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */ -/* Flags & variables */ + /* SUBSTITUTION COMMAND SPECIFIC FIELDS */ -typedef enum { f_none, f_replace, f_append } sed_function; + /* sed -e 's/sub_match/replace/' */ + regex_t *sub_match; + char *replace; -#define NO_LINE -2 -#define LAST_LINE -1 -static int addr_line = NO_LINE; -static char *addr_pattern = NULL; -static int negated = 0; + /* EDIT COMMAND (a,i,c) SPECIFIC FIELDS */ + char *editline; -#define SKIPSPACES(p) do { while (isspace(*(p))) (p)++; } while (0) + /* FILE COMMAND (r) SPECIFIC FIELDS */ + char *filename; -#define BUFSIZE 1024 + /* address storage */ + int beg_line; /* 'sed 1p' 0 == no begining line, apply commands to all lines */ + int end_line; /* 'sed 1,3p' 0 == no end line, use only beginning. -1 == $ */ + /* SUBSTITUTION COMMAND SPECIFIC FIELDS */ -static inline int at_last(FILE * fp) + unsigned int num_backrefs:4; /* how many back references (\1..\9) */ + /* Note: GNU/POSIX sed does not save more than nine backrefs, so + * we only use 4 bits to hold the number */ + unsigned int sub_g:1; /* sed -e 's/foo/bar/g' (global) */ + unsigned int sub_p:2; /* sed -e 's/foo/bar/p' (print substitution) */ + + /* GENERAL FIELDS */ + char delimiter; /* The delimiter used to separate regexps */ + + /* the command */ + char cmd; /* p,d,s (add more at your leisure :-) */ + + /* inversion flag */ + int invert; /* the '!' after the address */ +}; + +/* globals */ +static struct sed_cmd *sed_cmds = NULL; /* growable arrary holding a sequence of sed cmds */ +static int ncmds = 0; /* number of sed commands */ + +/*static char *cur_file = NULL;*/ /* file currently being processed XXX: do I need this? */ + +const char * const semicolon_whitespace = "; \n\r\t\v\0"; + +#ifdef CONFIG_FEATURE_CLEAN_UP +static void destroy_cmd_strs(void) { - int res = 0; + if (sed_cmds == NULL) + return; - if (feof(fp)) - return 1; - else { - int ch; + /* destroy all the elements in the array */ + while (--ncmds >= 0) { - if ((ch = fgetc(fp)) == EOF) - res++; - ungetc(ch, fp); + if (sed_cmds[ncmds].beg_match) { + regfree(sed_cmds[ncmds].beg_match); + free(sed_cmds[ncmds].beg_match); + } + if (sed_cmds[ncmds].end_match) { + regfree(sed_cmds[ncmds].end_match); + free(sed_cmds[ncmds].end_match); + } + if (sed_cmds[ncmds].sub_match) { + regfree(sed_cmds[ncmds].sub_match); + free(sed_cmds[ncmds].sub_match); + } + if (sed_cmds[ncmds].replace) + free(sed_cmds[ncmds].replace); } - return res; + + /* destroy the array */ + free(sed_cmds); + sed_cmds = NULL; } +#endif -static void do_sed_repl(FILE * fp, char *needle, char *newNeedle, - int ignoreCase, int printFlag, int quietFlag) + +/* + * index_of_next_unescaped_regexp_delim - walks left to right through a string + * beginning at a specified index and returns the index of the next regular + * expression delimiter (typically a forward * slash ('/')) not preceeded by + * a backslash ('\'). + */ +static int index_of_next_unescaped_regexp_delim(const struct sed_cmd * const sed_cmd, const char *str, int idx) { - int foundOne = FALSE; - char haystack[BUFSIZE]; - int line = 1, doit; - - while (fgets(haystack, BUFSIZE - 1, fp)) { - doit = 0; - if (addr_pattern) { - doit = !find_match(haystack, addr_pattern, FALSE); - } else if (addr_line == NO_LINE) - doit = 1; - else if (addr_line == LAST_LINE) { - if (at_last(fp)) - doit = 1; - } else { - if (line == addr_line) - doit = 1; - } - if (negated) - doit = 1 - doit; - if (doit) { - foundOne = - replace_match(haystack, needle, newNeedle, ignoreCase); - - if (foundOne == TRUE && printFlag == TRUE) { - fprintf(stdout, haystack); - } + int bracket = -1; + int escaped = 0; + char ch; + + for ( ; (ch = str[idx]); idx++) { + if (bracket != -1) { + if (ch == ']' && !(bracket == idx - 1 || + (bracket == idx - 2 && str[idx-1] == '^'))) + bracket = -1; + } else if (escaped) + escaped = 0; + else if (ch == '\\') + escaped = 1; + else if (ch == '[') + bracket = idx; + else if (ch == sed_cmd->delimiter) + return idx; + } + + /* if we make it to here, we've hit the end of the string */ + return -1; +} + +/* + * returns the index in the string just past where the address ends. + */ +static int get_address(struct sed_cmd *sed_cmd, const char *str, int *linenum, regex_t **regex) +{ + char *my_str = xstrdup(str); + int idx = 0; + char olddelimiter; + olddelimiter = sed_cmd->delimiter; + sed_cmd->delimiter = '/'; + + if (isdigit(my_str[idx])) { + do { + idx++; + } while (isdigit(my_str[idx])); + my_str[idx] = 0; + *linenum = atoi(my_str); + } + else if (my_str[idx] == '$') { + *linenum = -1; + idx++; + } + else if (my_str[idx] == '/' || my_str[idx] == '\\') { + if (my_str[idx] == '\\') { + my_str[idx] = 0; + sed_cmd-> delimiter = my_str[++idx]; } + idx = index_of_next_unescaped_regexp_delim(sed_cmd, my_str, ++idx); + if (idx == -1) + error_msg_and_die("unterminated match expression"); + my_str[idx] = '\0'; + *regex = (regex_t *)xmalloc(sizeof(regex_t)); + xregcomp(*regex, my_str+1, REG_NEWLINE); + idx++; /* so it points to the next character after the last '/' */ + } + else { + error_msg("get_address: no address found in string\n" + "\t(you probably didn't check the string you passed me)"); + idx = -1; + } + + free(my_str); + sed_cmd->delimiter = olddelimiter; + return idx; +} + +static int parse_subst_cmd(struct sed_cmd * const sed_cmd, const char *substr) +{ + int oldidx, cflags = REG_NEWLINE; + char *match; + int idx = 0; + int j; + + /* + * the string that gets passed to this function should look like this: + * s/match/replace/gIp + * || | ||| + * mandatory optional + * + * (all three of the '/' slashes are mandatory) + */ + + /* verify that the 's' is followed by something. That something + * (typically a 'slash') is now our regexp delimiter... */ + if (!substr[++idx]) + error_msg_and_die("bad format in substitution expression"); + else + sed_cmd->delimiter=substr[idx]; + + /* save the match string */ + oldidx = idx+1; + idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx); + if (idx == -1) + error_msg_and_die("bad format in substitution expression"); + match = xstrndup(substr + oldidx, idx - oldidx); + + /* determine the number of back references in the match string */ + /* Note: we compute this here rather than in the do_subst_command() + * function to save processor time, at the expense of a little more memory + * (4 bits) per sed_cmd */ + + /* sed_cmd->num_backrefs = 0; */ /* XXX: not needed? --apparently not */ + for (j = 0; match[j]; j++) { + /* GNU/POSIX sed does not save more than nine backrefs */ + if (match[j] == '\\' && match[j+1] == '(' && sed_cmd->num_backrefs <= 9) + sed_cmd->num_backrefs++; + } - if (quietFlag == FALSE) { - fprintf(stdout, haystack); + /* save the replacement string */ + oldidx = idx+1; + idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx); + if (idx == -1) + error_msg_and_die("bad format in substitution expression"); + sed_cmd->replace = xstrndup(substr + oldidx, idx - oldidx); + + /* process the flags */ + while (substr[++idx]) { + switch (substr[idx]) { + case 'g': + sed_cmd->sub_g = 1; + break; + case 'I': + cflags |= REG_ICASE; + break; + case 'p': + sed_cmd->sub_p = 1; + break; + default: + /* any whitespace or semicolon trailing after a s/// is ok */ + if (strchr(semicolon_whitespace, substr[idx])) + goto out; + /* else */ + error_msg_and_die("bad option in substitution expression"); } + } + +out: + /* compile the match string into a regex */ + sed_cmd->sub_match = (regex_t *)xmalloc(sizeof(regex_t)); + xregcomp(sed_cmd->sub_match, match, cflags); + free(match); + + return idx; +} + +static void move_back(char *str, int offset) +{ + memmove(str, str + offset, strlen(str + offset) + 1); +} + +static int parse_edit_cmd(struct sed_cmd *sed_cmd, const char *editstr) +{ + int i, j; + + /* + * the string that gets passed to this function should look like this: + * + * need one of these + * | + * | this backslash (immediately following the edit command) is mandatory + * | | + * [aic]\ + * TEXT1\ + * TEXT2\ + * TEXTN + * + * as soon as we hit a TEXT line that has no trailing '\', we're done. + * this means a command like: + * + * i\ + * INSERTME + * + * is a-ok. + * + */ + + if (editstr[1] != '\\' || (editstr[2] != '\n' && editstr[2] != '\r')) + error_msg_and_die("bad format in edit expression"); + + /* store the edit line text */ + sed_cmd->editline = xmalloc(strlen(&editstr[3]) + 2); + for (i = 3, j = 0; editstr[i] != '\0' && strchr("\r\n", editstr[i]) == NULL; + i++, j++) { + if (editstr[i] == '\\' && strchr("\n\r", editstr[i+1]) != NULL) { + sed_cmd->editline[j] = '\n'; + i++; + } else + sed_cmd->editline[j] = editstr[i]; + } - line++; + /* figure out if we need to add a newline */ + if (sed_cmd->editline[j-1] != '\n') + sed_cmd->editline[j++] = '\n'; + + /* terminate string */ + sed_cmd->editline[j] = '\0'; + + return i; +} + + +static int parse_file_cmd(struct sed_cmd *sed_cmd, const char *filecmdstr) +{ + int idx = 0; + int filenamelen = 0; + + /* + * the string that gets passed to this function should look like this: + * '[ ]filename' + * | | + * | a filename + * | + * optional whitespace + + * re: the file to be read, the GNU manual says the following: "Note that + * if filename cannot be read, it is treated as if it were an empty file, + * without any error indication." Thus, all of the following commands are + * perfectly leagal: + * + * sed -e '1r noexist' + * sed -e '1r ;' + * sed -e '1r' + */ + + /* the file command may be followed by whitespace; move past it. */ + while (isspace(filecmdstr[++idx])) + { ; } + + /* the first non-whitespace we get is a filename. the filename ends when we + * hit a normal sed command terminator or end of string */ + filenamelen = strcspn(&filecmdstr[idx], semicolon_whitespace); + sed_cmd->filename = xmalloc(filenamelen + 1); + safe_strncpy(sed_cmd->filename, &filecmdstr[idx], filenamelen + 1); + + return idx + filenamelen; +} + + +static char *parse_cmd_str(struct sed_cmd * const sed_cmd, const char *const cmdstr) +{ + int idx = 0; + + /* parse the command + * format is: [addr][,addr]cmd + * |----||-----||-| + * part1 part2 part3 + */ + + /* first part (if present) is an address: either a number or a /regex/ */ + if (isdigit(cmdstr[idx]) || cmdstr[idx] == '/') + idx = get_address(sed_cmd, cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match); + + /* second part (if present) will begin with a comma */ + if (cmdstr[idx] == ',') { + idx++; + idx += get_address(sed_cmd, &cmdstr[idx], &sed_cmd->end_line, &sed_cmd->end_match); + } + + /* skip whitespace before the command */ + while (isspace(cmdstr[idx])) + idx++; + + /* there my be the inversion flag between part2 and part3 */ + sed_cmd->invert = 0; + if (cmdstr[idx] == '!') { + sed_cmd->invert = 1; + idx++; + + /* skip whitespace before the command */ + while (isspace(cmdstr[idx])) + idx++; + } + + /* last part (mandatory) will be a command */ + if (cmdstr[idx] == '\0') + error_msg_and_die("missing command"); + sed_cmd->cmd = cmdstr[idx]; + + /* if it was a single-letter command that takes no arguments (such as 'p' + * or 'd') all we need to do is increment the index past that command */ + if (strchr("pd", sed_cmd->cmd)) { + idx++; + } + /* handle (s)ubstitution command */ + else if (sed_cmd->cmd == 's') { + idx += parse_subst_cmd(sed_cmd, &cmdstr[idx]); + } + /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */ + else if (strchr("aic", sed_cmd->cmd)) { + if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c') + error_msg_and_die("only a beginning address can be specified for edit commands"); + idx += parse_edit_cmd(sed_cmd, &cmdstr[idx]); } + /* handle file cmds: (r)ead */ + else if (sed_cmd->cmd == 'r') { + if (sed_cmd->end_line || sed_cmd->end_match) + error_msg_and_die("Command only uses one address"); + idx += parse_file_cmd(sed_cmd, &cmdstr[idx]); + } + else { + error_msg_and_die("invalid command"); + } + + /* give back whatever's left over */ + return (char *)&cmdstr[idx]; } -static void do_sed_append(FILE * fp, char *appendline, int quietFlag) +static void add_cmd_str(const char * const cmdstr) { - char buffer[BUFSIZE]; - int line = 1, doit; - - while (fgets(buffer, BUFSIZE - 1, fp)) { - doit = 0; - if (addr_pattern) { - doit = !find_match(buffer, addr_pattern, FALSE); - } else if (addr_line == NO_LINE) - doit = 1; - else if (addr_line == LAST_LINE) { - if (at_last(fp)) - doit = 1; - } else { - if (line == addr_line) - doit = 1; + char *mystr = (char *)cmdstr; + + do { + + /* trim leading whitespace and semicolons */ + move_back(mystr, strspn(mystr, semicolon_whitespace)); + /* if we ate the whole thing, that means there was just trailing + * whitespace or a final / no-op semicolon. either way, get out */ + if (strlen(mystr) == 0) + return; + /* if this is a comment, jump past it and keep going */ + if (mystr[0] == '#') { + mystr = strpbrk(mystr, "\n\r"); + continue; } - if (negated) - doit = 1 - doit; - if (quietFlag == FALSE) { - fprintf(stdout, buffer); + /* grow the array */ + sed_cmds = xrealloc(sed_cmds, sizeof(struct sed_cmd) * (++ncmds)); + /* zero new element */ + memset(&sed_cmds[ncmds-1], 0, sizeof(struct sed_cmd)); + /* load command string into new array element, get remainder */ + mystr = parse_cmd_str(&sed_cmds[ncmds-1], mystr); + + } while (mystr && strlen(mystr)); +} + + +static void load_cmd_file(char *filename) +{ + FILE *cmdfile; + char *line; + char *nextline; + + cmdfile = xfopen(filename, "r"); + + while ((line = get_line_from_file(cmdfile)) != NULL) { + /* if a line ends with '\' it needs the next line appended to it */ + while (line[strlen(line)-2] == '\\' && + (nextline = get_line_from_file(cmdfile)) != NULL) { + line = xrealloc(line, strlen(line) + strlen(nextline) + 1); + strcat(line, nextline); + free(nextline); } - if (doit) { - fputs(appendline, stdout); - fputc('\n', stdout); + /* eat trailing newline (if any) --if I don't do this, edit commands + * (aic) will print an extra newline */ + chomp(line); + add_cmd_str(line); + free(line); + } +} + +struct pipeline { + char *buf; + int idx; + int len; +}; + +#define PIPE_MAGIC 0x7f +#define PIPE_GROW 64 + +void pipe_putc(struct pipeline *const pipeline, char c) +{ + if (pipeline->buf[pipeline->idx] == PIPE_MAGIC) { + pipeline->buf = + xrealloc(pipeline->buf, pipeline->len + PIPE_GROW); + memset(pipeline->buf + pipeline->len, 0, PIPE_GROW); + pipeline->len += PIPE_GROW; + pipeline->buf[pipeline->len - 1] = PIPE_MAGIC; + } + pipeline->buf[pipeline->idx++] = (c); +} + +#define pipeputc(c) pipe_putc(pipeline, c) + +#if 0 +{ if (pipeline[pipeline_idx] == PIPE_MAGIC) { \ + pipeline = xrealloc(pipeline, pipeline_len+PIPE_GROW); \ + memset(pipeline+pipeline_len, 0, PIPE_GROW); \ + pipeline_len += PIPE_GROW; \ + pipeline[pipeline_len-1] = PIPE_MAGIC; } \ + pipeline[pipeline_idx++] = (c); } +#endif + +static void print_subst_w_backrefs(const char *line, const char *replace, + regmatch_t *regmatch, struct pipeline *const pipeline, int matches) +{ + int i; + + /* go through the replacement string */ + for (i = 0; replace[i]; i++) { + /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */ + if (replace[i] == '\\' && isdigit(replace[i+1])) { + int j; + char tmpstr[2]; + int backref; + ++i; /* i now indexes the backref number, instead of the leading slash */ + tmpstr[0] = replace[i]; + tmpstr[1] = 0; + backref = atoi(tmpstr); + /* print out the text held in regmatch[backref] */ + if (backref <= matches && regmatch[backref].rm_so != -1) + for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++) + pipeputc(line[j]); + } + + /* if we find a backslash escaped character, print the character */ + else if (replace[i] == '\\') { + ++i; + pipeputc(replace[i]); } - line++; + /* if we find an unescaped '&' print out the whole matched text. + * fortunately, regmatch[0] contains the indicies to the whole matched + * expression (kinda seems like it was designed for just such a + * purpose...) */ + else if (replace[i] == '&' && replace[i-1] != '\\') { + int j; + for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++) + pipeputc(line[j]); + } + /* nothing special, just print this char of the replacement string to stdout */ + else + pipeputc(replace[i]); } } -extern int sed_main(int argc, char **argv) +static int do_subst_command(const struct sed_cmd *sed_cmd, char **line) { - FILE *fp; - char *needle = NULL, *newNeedle = NULL; - char *name; - char *cp; - int ignoreCase = FALSE; - int printFlag = FALSE; - int quietFlag = FALSE; - int stopNow; - char *line_s = NULL, saved; - char *appendline = NULL; - char *pos; - sed_function sed_f = f_none; - - argc--; - argv++; - if (argc < 1) { - usage(sed_usage); + char *hackline = *line; + struct pipeline thepipe = { NULL, 0 , 0}; + struct pipeline *const pipeline = &thepipe; + int altered = 0; + regmatch_t *regmatch = NULL; + + /* we only proceed if the substitution 'search' expression matches */ + if (regexec(sed_cmd->sub_match, hackline, 0, NULL, 0) == REG_NOMATCH) + return 0; + + /* whaddaya know, it matched. get the number of back references */ + regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs+1)); + + /* allocate more PIPE_GROW bytes + if replaced string is larger than original */ + thepipe.len = strlen(hackline)+PIPE_GROW; + thepipe.buf = xcalloc(1, thepipe.len); + /* buffer magic */ + thepipe.buf[thepipe.len-1] = PIPE_MAGIC; + + /* and now, as long as we've got a line to try matching and if we can match + * the search string, we make substitutions */ + while ((*hackline || !altered) && (regexec(sed_cmd->sub_match, hackline, + sed_cmd->num_backrefs+1, regmatch, 0) != REG_NOMATCH) ) { + int i; + + /* print everything before the match */ + for (i = 0; i < regmatch[0].rm_so; i++) + pipeputc(hackline[i]); + + /* then print the substitution string */ + print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch, + pipeline, sed_cmd->num_backrefs); + + /* advance past the match */ + hackline += regmatch[0].rm_eo; + /* flag that something has changed */ + altered++; + + /* if we're not doing this globally, get out now */ + if (!sed_cmd->sub_g) + break; } - while (argc > 1) { - if (**argv != '-') - usage(sed_usage); - argc--; - cp = *argv++; - stopNow = FALSE; + for (; *hackline; hackline++) pipeputc(*hackline); + if (thepipe.buf[thepipe.idx] == PIPE_MAGIC) thepipe.buf[thepipe.idx] = 0; - while (*++cp && stopNow == FALSE) { - switch (*cp) { - case 'n': - quietFlag = TRUE; - break; - case 'e': - if (*(cp + 1) == 0 && --argc < 0) { - usage(sed_usage); - } - if (*++cp != 's') - cp = *argv++; - - /* Read address if present */ - SKIPSPACES(cp); - if (*cp == '$') { - addr_line = LAST_LINE; - cp++; - } else { - if (isdigit(*cp)) { /* LINE ADDRESS */ - line_s = cp; - while (isdigit(*cp)) - cp++; - if (cp > line_s) { - /* numeric line */ - saved = *cp; - *cp = '\0'; - addr_line = atoi(line_s); - *cp = saved; - } - } else if (*cp == '/') { /* PATTERN ADDRESS */ - pos = addr_pattern = cp + 1; - pos = strchr(pos, '/'); - if (!pos) - usage(sed_usage); - *pos = '\0'; - cp = pos + 1; - } - } + /* cleanup */ + free(regmatch); - SKIPSPACES(cp); - if (*cp == '!') { - negated++; - cp++; - } + free(*line); + *line = thepipe.buf; + return altered; +} - /* Read command */ - SKIPSPACES(cp); - switch (*cp) { - case 's': /* REPLACE */ - if (strlen(cp) <= 3 || *(cp + 1) != '/') +static void process_file(FILE *file) +{ + char *line = NULL; + static int linenum = 0; /* GNU sed does not restart counting lines at EOF */ + unsigned int still_in_range = 0; + int altered; + int i; + + /* go through every line in the file */ + while ((line = get_line_from_file(file)) != NULL) { + + chomp(line); + linenum++; + altered = 0; + + /* for every line, go through all the commands */ + for (i = 0; i < ncmds; i++) { + struct sed_cmd *sed_cmd = &sed_cmds[i]; + int deleted = 0; + + /* + * entry point into sedding... + */ + int matched = ( + /* no range necessary */ + (sed_cmd->beg_line == 0 && sed_cmd->end_line == 0 && + sed_cmd->beg_match == NULL && + sed_cmd->end_match == NULL) || + /* this line number is the first address we're looking for */ + (sed_cmd->beg_line && (sed_cmd->beg_line == linenum)) || + /* this line matches our first address regex */ + (sed_cmd->beg_match && (regexec(sed_cmd->beg_match, line, 0, NULL, 0) == 0)) || + /* we are currently within the beginning & ending address range */ + still_in_range + ); + + if (sed_cmd->invert ^ matched) { + + /* + * actual sedding + */ + switch (sed_cmd->cmd) { + + case 'p': + puts(line); break; - sed_f = f_replace; - pos = needle = cp + 2; + case 'd': + altered++; + deleted = 1; + break; + + case 's': + + /* + * Some special cases for 's' printing to make it compliant with + * GNU sed printing behavior (aka "The -n | s///p Matrix"): + * + * -n ONLY = never print anything regardless of any successful + * substitution + * + * s///p ONLY = always print successful substitutions, even if + * the line is going to be printed anyway (line will be printed + * twice). + * + * -n AND s///p = print ONLY a successful substitution ONE TIME; + * no other lines are printed - this is the reason why the 'p' + * flag exists in the first place. + */ + + /* if the user specified that they didn't want anything printed (i.e., a -n + * flag and no 'p' flag after the s///), then there's really no point doing + * anything here. */ + if (be_quiet && !sed_cmd->sub_p) + break; + + /* we print the line once, unless we were told to be quiet */ + if (!be_quiet) + altered |= do_subst_command(sed_cmd, &line); + + /* we also print the line if we were given the 'p' flag + * (this is quite possibly the second printing) */ + if (sed_cmd->sub_p) + altered |= do_subst_command(sed_cmd, &line); + if (altered && (i+1 >= ncmds || sed_cmds[i+1].cmd != 's')) + puts(line); - for (;;) { - pos = strchr(pos, '/'); - if (pos == NULL) { - usage(sed_usage); - } - if (*(pos - 1) == '\\') { - pos++; - continue; - } break; - } - *pos = 0; - newNeedle = ++pos; - for (;;) { - pos = strchr(pos, '/'); - if (pos == NULL) { - usage(sed_usage); - } - if (*(pos - 1) == '\\') { - pos++; - continue; - } + + case 'a': + puts(line); + fputs(sed_cmd->editline, stdout); + altered++; + break; + + case 'i': + fputs(sed_cmd->editline, stdout); break; - } - *pos = 0; - if (pos + 2 != 0) { - while (*++pos) { - switch (*pos) { - case 'i': - ignoreCase = TRUE; - break; - case 'p': - printFlag = TRUE; - break; - case 'g': - break; - default: - usage(sed_usage); - } + + case 'c': + /* single-address case */ + if ((sed_cmd->end_match == NULL && sed_cmd->end_line == 0) + /* multi-address case */ + /* - matching text */ + || (sed_cmd->end_match && (regexec(sed_cmd->end_match, line, 0, NULL, 0) == 0)) + /* - matching line numbers */ + || (sed_cmd->end_line > 0 && sed_cmd->end_line == linenum)) + { + fputs(sed_cmd->editline, stdout); } - } - cp = pos; - /* fprintf(stderr, "replace '%s' with '%s'\n", needle, newNeedle); */ - break; + altered++; - case 'a': /* APPEND */ - if (strlen(cp) < 2) break; - sed_f = f_append; - appendline = ++cp; - /* fprintf(stderr, "append '%s'\n", appendline); */ - break; + + case 'r': { + FILE *outfile; + puts(line); + outfile = fopen(sed_cmd->filename, "r"); + if (outfile) + print_file(outfile); + /* else if we couldn't open the output file, + * no biggie, just don't print anything */ + altered++; + } + break; } + } - stopNow = TRUE; - break; + /* + * exit point from sedding... + */ + if (matched) { + if ( + /* this is a single-address command or... */ + (sed_cmd->end_line == 0 && sed_cmd->end_match == NULL) || ( + /* we were in the middle of our address range (this + * isn't the first time through) and.. */ + (still_in_range == 1) && ( + /* this line number is the last address we're looking for or... */ + (sed_cmd->end_line && (sed_cmd->end_line == linenum)) || + /* this line matches our last address regex */ + (sed_cmd->end_match && (regexec(sed_cmd->end_match, line, 0, NULL, 0) == 0)) + ) + ) + ) { + /* we're out of our address range */ + still_in_range = 0; + } - default: - usage(sed_usage); + /* didn't hit the exit? then we're still in the middle of an address range */ + else { + still_in_range = 1; + } } - } - } - if (argc == 0) { - switch (sed_f) { - case f_none: - break; - case f_replace: - do_sed_repl(stdin, needle, newNeedle, ignoreCase, printFlag, - quietFlag); - break; - case f_append: - do_sed_append(stdin, appendline, quietFlag); - break; + if (deleted) + break; } - } else { - while (argc-- > 0) { - name = *argv++; - - fp = fopen(name, "r"); - if (fp == NULL) { - perror(name); - continue; - } - switch (sed_f) { - case f_none: + /* we will print the line unless we were told to be quiet or if the + * line was altered (via a 'd'elete or 's'ubstitution), in which case + * the altered line was already printed */ + if (!be_quiet && !altered) + puts(line); + + free(line); + } +} + +extern int sed_main(int argc, char **argv) +{ + int opt, status = EXIT_SUCCESS; + +#ifdef CONFIG_FEATURE_CLEAN_UP + /* destroy command strings on exit */ + if (atexit(destroy_cmd_strs) == -1) + perror_msg_and_die("atexit"); +#endif + + /* do normal option parsing */ + while ((opt = getopt(argc, argv, "ne:f:")) > 0) { + switch (opt) { + case 'n': + be_quiet++; break; - case f_replace: - do_sed_repl(fp, needle, newNeedle, ignoreCase, printFlag, - quietFlag); + case 'e': + add_cmd_str(optarg); break; - case f_append: - do_sed_append(fp, appendline, quietFlag); + case 'f': + load_cmd_file(optarg); break; - } - - if (ferror(fp)) - perror(name); + default: + show_usage(); + } + } - fclose(fp); + /* if we didn't get a pattern from a -e and no command file was specified, + * argv[optind] should be the pattern. no pattern, no worky */ + if (ncmds == 0) { + if (argv[optind] == NULL) + show_usage(); + else { + add_cmd_str(argv[optind]); + optind++; } } - exit(TRUE); -} -/* END CODE */ + /* argv[(optind)..(argc-1)] should be names of file to process. If no + * files were specified or '-' was specified, take input from stdin. + * Otherwise, we process all the files specified. */ + if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) { + process_file(stdin); + } + else { + int i; + FILE *file; + for (i = optind; i < argc; i++) { + file = wfopen(argv[i], "r"); + if (file) { + process_file(file); + fclose(file); + } else + status = EXIT_FAILURE; + } + } + + return status; +}