-/* 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 <andersen@lineo.com>, <andersee@debian.org>
- *
- * Modifications for addresses and append command have been
- * written by Marco Pantaleoni <panta@prosa.it>, <panta@elasticworld.org>
- * and are:
- * Copyright (C) 1999 Marco Pantaleoni.
+ * Written by Mark Whitley <markw@lineo.com>, <markw@enol.com>
*
* 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
*
*/
-#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
+ - 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 support for characters other than the '/' character for regex matches
+ - 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 <dirent.h>
+#include <unistd.h> /* for getopt() */
+#include <regex.h>
+#include <string.h> /* for strdup() */
#include <errno.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <ctype.h>
-
-static const char sed_usage[] =
- "sed [-n] -e script [file...]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nAllowed 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 expressions.\n";
-#else
- "This version of sed matches strings (not full regular expressions).\n"
+#include <ctype.h> /* for isspace() */
+#include "internal.h"
+
+#define bb_need_full_version
+#define BB_DECLARE_EXTERN
+#include "messages.c"
+
+/* externs */
+extern int optind; /* in unistd.h */
+extern char *optarg; /* ditto */
+
+/* options */
+static int be_quiet = 0;
+
+static const int SUB_G = 1 << 0;
+#ifdef BB_FEATURE_SED_PATTERN_SPACE
+static const int SUB_P = 1 << 1;
#endif
+
+struct sed_cmd {
+
+ /* 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 */
+ regex_t *sub_match; /* sed -e 's/sub_match/replace/' */
+ char *replace; /* sed -e 's/sub_match/replace/' XXX: who will hold the \1 \2 \3s? */
+ 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 */
+#ifndef BB_FEATURE_SED_PATTERN_SPACE
+ unsigned int sub_flags:1; /* sed -e 's/foo/bar/g' (global) */
+#else
+ unsigned int sub_flags:2; /* sed -e 's/foo/bar/gp' (global/pattern) */
#endif
- ;
-/* Flags & variables */
+ /* edit command (a,i,c) speicific field */
+ char *editline;
+};
-typedef enum { f_none, f_replace, f_append } sed_function;
+/* globals */
+static struct sed_cmd *sed_cmds = NULL; /* growable arrary holding a sequence of sed cmds */
+static int ncmds = 0; /* number of sed commands */
-#define NO_LINE -2
-#define LAST_LINE -1
-static int addr_line = NO_LINE;
-static char *addr_pattern = NULL;
-static int negated = 0;
+/*static char *cur_file = NULL;*/ /* file currently being processed XXX: do I need this? */
-#define SKIPSPACES(p) do { while (isspace(*(p))) (p)++; } while (0)
+#ifdef BB_FEATURE_CLEAN_UP
+static void destroy_cmd_strs()
+{
+ if (sed_cmds == NULL)
+ return;
-#define BUFSIZE 1024
+ /* 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);
+ }
-static inline int at_last(FILE * fp)
+ /* destroy the array */
+ free(sed_cmds);
+ sed_cmds = NULL;
+}
+#endif
+
+#if 0
+/*
+ * trim_str - trims leading and trailing space from a string
+ *
+ * Note: This returns a malloc'ed string so you must store and free it
+ * XXX: This should be in the utility.c file.
+ * XXX: This is now obsolete. Maybe it belongs nowhere.
+ */
+static char *trim_str(const char *str)
{
- int res = 0;
+ int i;
+ char *retstr = strdup(str);
+
+ /* trim leading whitespace */
+ memmove(retstr, &retstr[strspn(retstr, " \n\t\v")], strlen(retstr));
+
+ /* trim trailing whitespace */
+ i = strlen(retstr) - 1;
+ while (isspace(retstr[i]))
+ i--;
+ retstr[++i] = 0;
+
+ /* Aside:
+ *
+ * you know, a strrspn() would really be nice cuz then we could say:
+ *
+ * retstr[strrspn(retstr, " \n\t\v") + 1] = 0;
+ */
+
+ return retstr;
+}
+#endif
- if (feof(fp))
- return 1;
- else {
- int ch;
+#if 0
+/*
+ * strrspn - works just like strspn() but goes from right to left instead of
+ * left to right
+ */
+static size_t strrspn(const char *s, const char *accept)
+{
+ size_t i = strlen(s);
- if ((ch = fgetc(fp)) == EOF)
- res++;
- ungetc(ch, fp);
+ while (strchr(accept, s[--i]))
+ ;
+
+ return i;
+}
+#endif
+
+/*
+ * index_of_next_unescaped_slash - walks left to right through a string
+ * beginning at a specified index and returns the index of the next forward
+ * slash ('/') not preceeded by a backslash ('\').
+ */
+static int index_of_next_unescaped_slash(const char *str, int idx)
+{
+ for ( ; str[idx]; idx++) {
+ if (str[idx] == '/' && str[idx-1] != '\\')
+ return idx;
}
- return res;
+
+ /* if we make it to here, we've hit the end of the string */
+ return -1;
}
-static void do_sed_repl(FILE * fp, char *needle, char *newNeedle,
- int ignoreCase, int printFlag, int quietFlag)
+/*
+ * returns the index in the string just past where the address ends.
+ */
+static int get_address(const char *str, int *line, regex_t **regex)
{
- 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;
+ char *my_str = strdup(str);
+ int idx = 0;
+
+ if (isdigit(my_str[idx])) {
+ do {
+ idx++;
+ } while (isdigit(my_str[idx]));
+ my_str[idx] = 0;
+ *line = atoi(my_str);
+ }
+ else if (my_str[idx] == '$') {
+ *line = -1;
+ idx++;
+ }
+ else if (my_str[idx] == '/') {
+ idx = index_of_next_unescaped_slash(my_str, ++idx);
+ if (idx == -1)
+ fatalError("unterminated match expression\n");
+ 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 {
+ errorMsg("get_address: no address found in string\n"
+ "\t(you probably didn't check the string you passed me)\n");
+ idx = -1;
+ }
+
+ free(my_str);
+ return idx;
+}
+
+static char *strdup_substr(const char *str, int start, int end)
+{
+ int size = end - start + 1;
+ char *newstr = xmalloc(size);
+ memcpy(newstr, str+start, size-1);
+ newstr[size-1] = '\0';
+ return newstr;
+}
+
+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 a 'slash' */
+ if (substr[++idx] != '/')
+ fatalError("bad format in substitution expression\n");
+
+ /* save the match string */
+ oldidx = idx+1;
+ idx = index_of_next_unescaped_slash(substr, ++idx);
+ if (idx == -1)
+ fatalError("bad format in substitution expression\n");
+ match = strdup_substr(substr, oldidx, idx);
+
+ /* 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_slash(substr, ++idx);
+ if (idx == -1)
+ fatalError("bad format in substitution expression\n");
+ sed_cmd->replace = strdup_substr(substr, oldidx, idx);
+
+ /* process the flags */
+ while (substr[++idx]) {
+ switch (substr[idx]) {
+ case 'g':
+ sed_cmd->sub_flags = SUB_G;
+ break;
+ case 'I':
+ cflags |= REG_ICASE;
+ break;
+#ifdef BB_FEATURE_SED_PATTERN_SPACE
+ case 'p':
+ sed_cmd->sub_flags = SUB_P;
+ break;
+#endif
+ default:
+ /* any whitespace or semicolon trailing after a s/// is ok */
+ if (strchr("; \t\v\n\r", substr[idx]))
+ goto out;
+ /* else */
+ fatalError("bad option in substitution expression\n");
}
- if (negated)
- doit = 1 - doit;
- if (doit) {
- foundOne =
- replace_match(haystack, needle, newNeedle, ignoreCase);
-
- if (foundOne == TRUE && printFlag == TRUE) {
- fprintf(stdout, haystack);
+ }
+
+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'))
+ fatalError("bad format in edit expression\n");
+
+ /* 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';
+ }
- if (quietFlag == FALSE) {
- fprintf(stdout, haystack);
- }
+out:
+ ptr[idx] = '\n';
+ ptr[idx+1] = 0;
+
+ /* this accounts for discrepancies between the modified string and the
+ * original string passed in to this function */
+ idx += slashes_eaten;
+
+ /* this accounts for the fact that A) we started at index 3, not at index
+ * 0 and B) that we added an extra '\n' at the end (if you think the next
+ * line should read 'idx += 4' remember, arrays are zero-based) */
+
+ idx += 3;
+
+ return idx;
+}
+
+static char *parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
+{
+ int idx = 0;
- line++;
+ /* 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(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
+
+ /* second part (if present) will begin with a comma */
+ if (cmdstr[idx] == ',')
+ idx += get_address(&cmdstr[++idx], &sed_cmd->end_line, &sed_cmd->end_match);
+
+ /* last part (mandatory) will be a command */
+ if (cmdstr[idx] == '\0')
+ fatalError("missing command\n");
+ if (!strchr("pdsaic", cmdstr[idx])) /* <-- XXX add new commands here */
+ fatalError("invalid command\n");
+ sed_cmd->cmd = cmdstr[idx];
+
+ /* special-case handling for (s)ubstitution */
+ if (sed_cmd->cmd == 's') {
+ idx += parse_subst_cmd(sed_cmd, &cmdstr[idx]);
+ }
+ /* special-case handling for (a)ppend, (i)nsert, and (c)hange */
+ else if (strchr("aic", cmdstr[idx])) {
+ if (sed_cmd->end_line || sed_cmd->end_match)
+ fatalError("only a beginning address can be specified for edit commands\n");
+ idx += parse_edit_cmd(sed_cmd, &cmdstr[idx]);
}
+ /* if it was a single-letter command (such as 'p' or 'd') we need to
+ * increment the index past that command */
+ else
+ idx++;
+
+ /* 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 *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;
- }
- if (negated)
- doit = 1 - doit;
- if (quietFlag == FALSE) {
- fprintf(stdout, buffer);
- }
- if (doit) {
- fputs(appendline, stdout);
- fputc('\n', stdout);
+ 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));
+}
+
- line++;
+static void load_cmd_file(char *filename)
+{
+ FILE *cmdfile;
+ char *line;
+ char *nextline;
+
+ cmdfile = fopen(filename, "r");
+ if (cmdfile == NULL)
+ fatalError(strerror(errno));
+
+ 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 */
+ if (line[strlen(line)-1] == '\n')
+ line[strlen(line)-1] = 0;
+ add_cmd_str(line);
+ free(line);
}
}
-extern int sed_main(int argc, char **argv)
+static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch)
{
- 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);
- }
+ 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] */
+ for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
+ fputc(line[j], stdout);
+ }
- while (argc > 1) {
- if (**argv != '-')
- usage(sed_usage);
- argc--;
- cp = *argv++;
- stopNow = FALSE;
+ /* if we find a backslash escaped character, print the character */
+ else if (replace[i] == '\\') {
+ ++i;
+ fputc(replace[i], stdout);
+ }
- 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;
- }
- }
+ /* 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++)
+ fputc(line[j], stdout);
+ }
+ /* nothing special, just print this char of the replacement string to stdout */
+ else
+ fputc(replace[i], stdout);
+ }
+}
- SKIPSPACES(cp);
- if (*cp == '!') {
- negated++;
- cp++;
+static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
+{
+ int altered = 0;
+
+ /* we only substitute if the substitution 'search' expression matches */
+ if (regexec(sed_cmd->sub_match, line, 0, NULL, 0) == 0) {
+ regmatch_t *regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs+1));
+ int i;
+ char *ptr = (char *)line;
+
+ while (*ptr) {
+ /* if we can match the search string... */
+ if (regexec(sed_cmd->sub_match, ptr, sed_cmd->num_backrefs+1, regmatch, 0) == 0) {
+ /* print everything before the match, */
+ for (i = 0; i < regmatch[0].rm_so; i++) {
+#ifdef BB_FEATURE_SED_PATTERN_SPACE
+ if(!be_quiet || (sed_cmd->sub_flags & SUB_P))
+#endif
+ fputc(ptr[i], stdout);
}
- /* Read command */
-
- SKIPSPACES(cp);
- switch (*cp) {
- case 's': /* REPLACE */
- if (strlen(cp) <= 3 || *(cp + 1) != '/')
- break;
- sed_f = f_replace;
-
- pos = needle = cp + 2;
-
- 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;
- }
- 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);
- }
- }
- }
- cp = pos;
- /* fprintf(stderr, "replace '%s' with '%s'\n", needle, newNeedle); */
- break;
+ /* then print the substitution in its place */
+#ifdef BB_FEATURE_SED_PATTERN_SPACE
+ if(!be_quiet || (sed_cmd->sub_flags & SUB_P))
+#endif
+ print_subst_w_backrefs(ptr, sed_cmd->replace, regmatch);
- case 'a': /* APPEND */
- if (strlen(cp) < 2)
- break;
- sed_f = f_append;
- appendline = ++cp;
- /* fprintf(stderr, "append '%s'\n", appendline); */
- break;
- }
+ /* then advance past the match */
+ ptr += regmatch[0].rm_eo;
- stopNow = TRUE;
- break;
+ /* and flag that something has changed */
+ altered++;
- default:
- usage(sed_usage);
+ /* if we're not doing this globally... */
+ if (!sed_cmd->sub_flags & SUB_G)
+ break;
}
+ /* if we COULD NOT match the search string (meaning we've gone past
+ * all previous instances), get out */
+ else
+ break;
}
- }
- if (argc == 0) {
- switch (sed_f) {
- case f_none:
+ /* is there anything left to print? */
+#ifdef BB_FEATURE_SED_PATTERN_SPACE
+ if (*ptr && (!be_quiet || sed_cmds->sub_flags & SUB_P))
+#else
+ if (*ptr)
+#endif
+ fputs(ptr, stdout);
+
+ /* cleanup */
+ free(regmatch);
+ }
+
+ return altered;
+}
+
+static int do_sed_command(const struct sed_cmd *sed_cmd, const char *line)
+{
+ int altered = 0;
+
+ switch (sed_cmd->cmd) {
+
+ case 'p':
+ fputs(line, stdout);
break;
- case f_replace:
- do_sed_repl(stdin, needle, newNeedle, ignoreCase, printFlag,
- quietFlag);
+
+ case 'd':
+ altered++;
break;
- case f_append:
- do_sed_append(stdin, appendline, quietFlag);
+
+ case 's':
+ altered = do_subst_command(sed_cmd, line);
break;
- }
- } else {
- while (argc-- > 0) {
- name = *argv++;
-
- fp = fopen(name, "r");
- if (fp == NULL) {
- perror(name);
- continue;
+
+ case 'a':
+ fputs(line, stdout);
+ fputs(sed_cmd->editline, stdout);
+ altered++;
+ break;
+
+ case 'i':
+ fputs(sed_cmd->editline, stdout);
+ break;
+
+ case 'c':
+ fputs(sed_cmd->editline, stdout);
+ altered++;
+ break;
+ }
+
+ 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 line_altered;
+ int i;
+
+ /* go through every line in the file */
+ while ((line = get_line_from_file(file)) != NULL) {
+
+ linenum++;
+ line_altered = 0;
+
+ /* for every line, go through all the commands */
+ for (i = 0; i < ncmds; i++) {
+
+ /* are we acting on a range of matched lines? */
+ if (sed_cmds[i].beg_match && sed_cmds[i].end_match) {
+ if (still_in_range || regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0) {
+ line_altered += do_sed_command(&sed_cmds[i], line);
+ still_in_range = 1;
+ if (regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0)
+ still_in_range = 0;
+ }
}
- switch (sed_f) {
- case f_none:
- break;
- case f_replace:
- do_sed_repl(fp, needle, newNeedle, ignoreCase, printFlag,
- quietFlag);
- break;
- case f_append:
- do_sed_append(fp, appendline, quietFlag);
- break;
+ /* are we trying to match a single line? */
+ else if (sed_cmds[i].beg_match) {
+ if (regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0)
+ line_altered += do_sed_command(&sed_cmds[i], line);
+ }
+
+ /* are we acting on a range of line numbers? */
+ else if (sed_cmds[i].beg_line > 0 && sed_cmds[i].end_line != 0) {
+ if (linenum >= sed_cmds[i].beg_line && (sed_cmds[i].end_line == -1 || linenum <= sed_cmds[i].end_line))
+ line_altered += do_sed_command(&sed_cmds[i], line);
+ }
+
+ /* are we acting on a specified line number */
+ else if (sed_cmds[i].beg_line > 0) {
+ if (linenum == sed_cmds[i].beg_line)
+ line_altered += do_sed_command(&sed_cmds[i], line);
}
- if (ferror(fp))
- perror(name);
+ /* not acting on matches or line numbers. act on every line */
+ else
+ line_altered += do_sed_command(&sed_cmds[i], line);
- fclose(fp);
}
+
+ /* 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) */
+#ifndef BB_FEATURE_SED_PATTERN_SPACE
+ if (!be_quiet &&!line_altered)
+#else
+ /* we where specificly requested to print the output */
+ if ((!be_quiet || (sed_cmds[i].sub_flags & SUB_P)) && !line_altered)
+#endif
+ fputs(line, stdout);
+
+ free(line);
}
- exit(TRUE);
}
+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("sed");
+ exit(1);
+ }
+#endif
+
+ /* do normal option parsing */
+ while ((opt = getopt(argc, argv, "hne:f:")) > 0) {
+ switch (opt) {
+ case 'h':
+ usage(sed_usage);
+ break;
+ case 'n':
+ be_quiet++;
+ break;
+ case 'e':
+ add_cmd_str(optarg);
+ break;
+ case 'f':
+ load_cmd_file(optarg);
+ break;
+ }
+ }
+
+ /* 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)
+ usage(sed_usage);
+ else {
+ add_cmd_str(argv[optind]);
+ optind++;
+ }
+ }
+
-/* 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 = fopen(argv[i], "r");
+ if (file == NULL) {
+ errorMsg("%s: %s\n", argv[i], strerror(errno));
+ } else {
+ process_file(file);
+ fclose(file);
+ }
+ }
+ }
+
+ return 0;
+}
projects / oweals / busybox.git / blobdiff