X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=editors%2Fsed.c;h=0f0f4a28d19829907293ab7335e1fe544aee2ad8;hb=f1bbb22dca4d39aa227246f4c2ee90acd7e512a4;hp=d4b721e4944fc57226053f886730c60cdc332101;hpb=b610615be9aedfac07d1e01f12575707fa3a227c;p=oweals%2Fbusybox.git diff --git a/editors/sed.c b/editors/sed.c index d4b721e49..0f0f4a28d 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -1,15 +1,8 @@ -/* 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. + * Written by Mark Whitley , * * 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 @@ -27,333 +20,703 @@ * */ -#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 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" -#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" -#endif -#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 { -/* Flags & variables */ -typedef enum { f_none, f_replace, f_append } sed_function; + /* GENERAL FIELDS */ + char delimiter; /* The delimiter used to separate regexps */ -#define NO_LINE -2 -#define LAST_LINE -1 -static int addr_line = NO_LINE; -static char *addr_pattern = NULL; -static int negated = 0; + /* 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' */ -#define SKIPSPACES(p) do { while (isspace(*(p))) (p)++; } while (0) + /* the command */ + char cmd; /* p,d,s (add more at your leisure :-) */ -#define BUFSIZE 1024 -static inline int at_last(FILE * fp) + /* 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; +}; + +/* 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() { - 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(struct sed_cmd *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; + for ( ; str[idx]; idx++) { + if (str[idx] == sed_cmd->delimiter && str[idx-1] != '\\') + 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 *line, regex_t **regex) +{ + 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_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, 0); + 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); + 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 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 = 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_regexp_delim(sed_cmd, substr, ++idx); + if (idx == -1) + error_msg_and_die("bad format in substitution expression"); + sed_cmd->replace = strdup_substr(substr, oldidx, idx); + + /* 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"); } - 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')) + 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: + 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; + + /* parse the command + * format is: [addr][,addr]cmd + * |----||-----||-| + * part1 part2 part3 + */ - if (quietFlag == FALSE) { - fprintf(stdout, haystack); - } - line++; + /* 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"); + if (!strchr("pdsaic", cmdstr[idx])) /* <-- XXX add new commands here */ + error_msg_and_die("invalid command"); + 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) + error_msg_and_die("only a beginning address can be specified for edit commands"); + 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 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 do_sed_append(FILE * fp, char *appendline, int quietFlag) + +static void load_cmd_file(char *filename) { - 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; + 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 (negated) - doit = 1 - doit; - if (quietFlag == FALSE) { - fprintf(stdout, buffer); + /* 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); + } +} + +static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch) +{ + 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); } - if (doit) { - fputs(appendline, stdout); - fputc('\n', stdout); + + /* if we find a backslash escaped character, print the character */ + else if (replace[i] == '\\') { + ++i; + fputc(replace[i], stdout); } - 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++) + fputc(line[j], stdout); + } + /* nothing special, just print this char of the replacement string to stdout */ + else + fputc(replace[i], stdout); } } -extern int sed_main(int argc, char **argv) +static int do_subst_command(const struct sed_cmd *sed_cmd, const 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 = (char *)line; + int altered = 0; + regmatch_t *regmatch = NULL; + + /* we only proceed if the substitution 'search' expression matches */ + if (regexec(sed_cmd->sub_match, line, 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)); + + /* 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 && (regexec(sed_cmd->sub_match, hackline, + sed_cmd->num_backrefs+1, regmatch, 0) == 0) ) { + int i; + + /* print everything before the match */ + for (i = 0; i < regmatch[0].rm_so; i++) + fputc(hackline[i], stdout); + + /* then print the substitution string */ + print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch); + + /* 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; + /* if there's anything left of the line, print it */ + if (*hackline) + fputs(hackline, 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; - } - } + /* cleanup */ + free(regmatch); - SKIPSPACES(cp); - if (*cp == '!') { - negated++; - cp++; - } + return altered; +} - /* 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; - - case 'a': /* APPEND */ - if (strlen(cp) < 2) - break; - sed_f = f_append; - appendline = ++cp; - /* fprintf(stderr, "append '%s'\n", appendline); */ - break; - } +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 'd': + altered++; + break; - stopNow = TRUE; + 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; - default: - usage(sed_usage); - } - } - } + /* 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 (argc == 0) { - switch (sed_f) { - case f_none: break; - case f_replace: - do_sed_repl(stdin, needle, newNeedle, ignoreCase, printFlag, - quietFlag); + + case 'a': + fputs(line, stdout); + fputs(sed_cmd->editline, stdout); + altered++; break; - case f_append: - do_sed_append(stdin, appendline, quietFlag); + + case 'i': + fputs(sed_cmd->editline, stdout); break; - } - } else { - while (argc-- > 0) { - name = *argv++; - - fp = fopen(name, "r"); - if (fp == NULL) { - perror(name); - continue; + + 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); } - if (ferror(fp)) - perror(name); + /* 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); + } + + /* 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), in which case + * the altered line was already printed */ + if (!be_quiet && !line_altered) + fputs(line, stdout); + + free(line); } - return(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_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(); + } + } -/* END CODE */ + /* 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; +}