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-rw-r--r--sed.c850
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-/*
- * sed.c - very minimalist version of sed
- *
- * Copyright (C) 1999,2000,2001 by Lineo, inc.
- * Written by Mark Whitley <markw@lineo.com>, <markw@codepoet.org>
- *
- * 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-/*
- 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 <stdio.h>
-#include <unistd.h> /* for getopt() */
-#include <regex.h>
-#include <string.h> /* for strdup() */
-#include <errno.h>
-#include <ctype.h> /* for isspace() */
-#include <stdlib.h>
-#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 {
-
-
- /* GENERAL FIELDS */
- char delimiter; /* The delimiter used to separate regexps */
-
- /* 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 == $ */
- regex_t *beg_match; /* sed -e '/match/cmd' */
- regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
-
- /* the command */
- char cmd; /* p,d,s (add more at your leisure :-) */
-
-
- /* SUBSTITUTION COMMAND SPECIFIC FIELDS */
-
- /* sed -e 's/sub_match/replace/' */
- regex_t *sub_match;
- char *replace;
- 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) */
-
-
- /* EDIT COMMAND (a,i,c) SPEICIFIC FIELDS */
-
- char *editline;
-
-
- /* FILE COMMAND (r) SPEICIFIC FIELDS */
-
- char *filename;
-};
-
-/* 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? */
-
-#ifdef BB_FEATURE_CLEAN_UP
-static void destroy_cmd_strs()
-{
- if (sed_cmds == NULL)
- return;
-
- /* destroy all the elements in the array */
- while (--ncmds >= 0) {
-
- 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);
- }
-
- /* destroy the array */
- free(sed_cmds);
- sed_cmds = NULL;
-}
-#endif
-
-
-/*
- * 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(struct sed_cmd *sed_cmd, const char *str, int idx)
-{
- int bracket = -1;
- int escaped = 0;
-
- for ( ; str[idx]; idx++) {
- if (bracket != -1) {
- if (str[idx] == ']' && !(bracket == idx - 1 ||
- (bracket == idx - 2 && str[idx-1] == '^')))
- bracket = -1;
- } else if (escaped)
- escaped = 0;
- else if (str[idx] == '\\')
- escaped = 1;
- else if (str[idx] == '[')
- bracket = idx;
- else if (str[idx] == 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 = strdup(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] == '/') {
- 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 *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++;
- }
-
- /* 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("; \t\v\n\r", 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 int parse_edit_cmd(struct sed_cmd *sed_cmd, const char *editstr)
-{
- int idx = 0;
- int slashes_eaten = 0;
- char *ptr; /* shorthand */
-
- /*
- * 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 */
- /* make editline big enough to accomodate the extra '\n' we will tack on
- * to the end */
- sed_cmd->editline = xmalloc(strlen(&editstr[3]) + 2);
- strcpy(sed_cmd->editline, &editstr[3]);
- ptr = sed_cmd->editline;
-
- /* now we need to go through * and: s/\\[\r\n]$/\n/g on the edit line */
- while (ptr[idx]) {
- while (ptr[idx] != '\\' || (ptr[idx+1] != '\n' && ptr[idx+1] != '\r')) {
- idx++;
- if (!ptr[idx]) {
- goto out;
- }
- }
- /* move the newline over the '\' before it (effectively eats the '\') */
- memmove(&ptr[idx], &ptr[idx+1], strlen(&ptr[idx+1]));
- ptr[strlen(ptr)-1] = 0;
- slashes_eaten++;
- /* substitue \r for \n if needed */
- if (ptr[idx] == '\r')
- ptr[idx] = '\n';
- }
-
-out:
- /* this accounts for discrepancies between the modified string and the
- * original string passed in to this function */
- idx += slashes_eaten;
-
- /* figure out if we need to add a newline */
- if (ptr[idx-1] != '\n') {
- ptr[idx] = '\n';
- idx++;
- }
-
- /* terminate string */
- ptr[idx]= 0;
- /* adjust for opening 2 chars [aic]\ */
- idx += 2;
-
- return idx;
-}
-
-
-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], "; \n\r\t\v\0");
- 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 *sed_cmd, const char *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 += get_address(sed_cmd, &cmdstr[++idx], &sed_cmd->end_line, &sed_cmd->end_match);
-
- /* 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", cmdstr[idx])) {
- 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 add_cmd_str(const char *cmdstr)
-{
- char *mystr = (char *)cmdstr;
-
- do {
-
- /* trim leading whitespace and semicolons */
- memmove(mystr, &mystr[strspn(mystr, "; \n\r\t\v")], strlen(mystr));
- /* 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;
- }
- /* 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);
- }
- /* 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);
- }
-}
-
-#define PIPE_MAGIC 0x7f
-#define PIPE_GROW 64
-#define pipeputc(c) \
-{ 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); }
-
-static void print_subst_w_backrefs(const char *line, const char *replace,
- regmatch_t *regmatch, char **pipeline_p, int *pipeline_idx_p,
- int *pipeline_len_p, int matches)
-{
- char *pipeline = *pipeline_p;
- int pipeline_idx = *pipeline_idx_p;
- int pipeline_len = *pipeline_len_p;
- 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]);
- }
-
- /* 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]);
- }
- *pipeline_p = pipeline;
- *pipeline_idx_p = pipeline_idx;
- *pipeline_len_p = pipeline_len;
-}
-
-static int do_subst_command(const struct sed_cmd *sed_cmd, char **line)
-{
- char *hackline = *line;
- char *pipeline = 0;
- int pipeline_idx = 0;
- int pipeline_len = 0;
- 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 */
- pipeline_len = strlen(hackline)+PIPE_GROW;
- pipeline = xmalloc(pipeline_len);
- memset(pipeline, 0, pipeline_len);
- /* buffer magic */
- pipeline[pipeline_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, &pipeline_idx, &pipeline_len,
- 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;
- }
-
- for (; *hackline; hackline++) pipeputc(*hackline);
- if (pipeline[pipeline_idx] == PIPE_MAGIC) pipeline[pipeline_idx] = 0;
-
- /* cleanup */
- free(regmatch);
-
- free(*line);
- *line = pipeline;
- return altered;
-}
-
-
-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++) {
-
-
- /*
- * entry point into sedding...
- */
- if (
- /* no range necessary */
- (sed_cmds[i].beg_line == 0 && sed_cmds[i].end_line == 0 &&
- sed_cmds[i].beg_match == NULL &&
- sed_cmds[i].end_match == NULL) ||
- /* this line number is the first address we're looking for */
- (sed_cmds[i].beg_line && (sed_cmds[i].beg_line == linenum)) ||
- /* this line matches our first address regex */
- (sed_cmds[i].beg_match && (regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0)) ||
- /* we are currently within the beginning & ending address range */
- still_in_range
- ) {
-
- /*
- * actual sedding
- */
- switch (sed_cmds[i].cmd) {
-
- case 'p':
- puts(line);
- break;
-
- case 'd':
- altered++;
- 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_cmds[i].sub_p)
- break;
-
- /* we print the line once, unless we were told to be quiet */
- if (!be_quiet)
- altered |= do_subst_command(&sed_cmds[i], &line);
-
- /* we also print the line if we were given the 'p' flag
- * (this is quite possibly the second printing) */
- if (sed_cmds[i].sub_p)
- altered |= do_subst_command(&sed_cmds[i], &line);
- if (altered && (i+1 >= ncmds || sed_cmds[i+1].cmd != 's'))
- puts(line);
-
- break;
-
- case 'a':
- puts(line);
- fputs(sed_cmds[i].editline, stdout);
- altered++;
- break;
-
- case 'i':
- fputs(sed_cmds[i].editline, stdout);
- break;
-
- case 'c':
- /* single-address case */
- if (sed_cmds[i].end_match == NULL && sed_cmds[i].end_line == 0) {
- fputs(sed_cmds[i].editline, stdout);
- }
- /* multi-address case */
- else {
- /* matching text */
- if (sed_cmds[i].end_match && (regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0))
- fputs(sed_cmds[i].editline, stdout);
- /* matching line numbers */
- if (sed_cmds[i].end_line > 0 && sed_cmds[i].end_line == linenum)
- fputs(sed_cmds[i].editline, stdout);
- }
- altered++;
-
- break;
-
- case 'r': {
- FILE *outfile;
- puts(line);
- outfile = fopen(sed_cmds[i].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;
- }
-
- /*
- * exit point from sedding...
- */
- if (
- /* this is a single-address command or... */
- (sed_cmds[i].end_line == 0 && sed_cmds[i].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_cmds[i].end_line && (sed_cmds[i].end_line == linenum)) ||
- /* this line matches our last address regex */
- (sed_cmds[i].end_match && (regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0))
- )
- )
- ) {
- /* we're out of our address range */
- still_in_range = 0;
- }
-
- /* didn't hit the exit? then we're still in the middle of an address range */
- else {
- still_in_range = 1;
- }
- }
- }
-
- /* 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;
-
-#ifdef BB_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 'e':
- add_cmd_str(optarg);
- break;
- case 'f':
- load_cmd_file(optarg);
- break;
- default:
- show_usage();
- }
- }
-
- /* 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++;
- }
- }
-
-
- /* 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 = fopen(argv[i], "r");
- if (file == NULL) {
- perror_msg("%s", argv[i]);
- } else {
- process_file(file);
- fclose(file);
- }
- }
- }
-
- return 0;
-}