-/* 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.
+ * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
+ * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
+ * 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
*
*/
-#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 <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\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 <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 {
+ /* 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;
+}
projects / oweals / busybox.git / blobdiff