diff options
Diffstat (limited to 'editors/sed.c')
| -rw-r--r-- | editors/sed.c | 133 |
1 files changed, 50 insertions, 83 deletions
diff --git a/editors/sed.c b/editors/sed.c index 329f5ae..2fb243f 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -97,50 +97,6 @@ static const char sed_usage[] = #endif ; -#if 0 -/* Nuke from here { */ - - -/* get_line_from_file() - This function reads an entire line from a text file - * * up to a newline. It returns a malloc'ed char * which must be stored and - * * free'ed by the caller. */ -extern char *get_line_from_file(FILE *file) -{ - static const int GROWBY = 80; /* how large we will grow strings by */ - - int ch; - int idx = 0; - char *linebuf = NULL; - int linebufsz = 0; - - while (1) { - ch = fgetc(file); - if (ch == EOF) - break; - /* grow the line buffer as necessary */ - if (idx > linebufsz-2) - linebuf = realloc(linebuf, linebufsz += GROWBY); - linebuf[idx++] = (char)ch; - if ((char)ch == '\n') - break; - } - - if (idx == 0) - return NULL; - - linebuf[idx] = 0; - return linebuf; -} - -static void usage(const char *string) -{ - printf("usage: %s\n", string); - exit(0); -} - -/* } to here when we integrate this into busybox */ -#endif - static void destroy_cmd_strs() { if (sed_cmds == NULL) @@ -246,29 +202,15 @@ static int get_address(const char *str, int *line, regex_t **regex) idx++; } else if (my_str[idx] == '/') { - int ret; idx = index_of_next_unescaped_slash(idx, my_str); - if (idx == -1) { - free(my_str); + if (idx == -1) exit_sed(1, "sed: unterminated match expression\n"); - } - my_str[idx] = 0; /* shave off the trailing '/' */ - my_str++; /* shave off the leading '/' */ - *regex = (regex_t *)malloc(sizeof(regex_t)); - if ((ret = regcomp(*regex, my_str, 0)) != 0) { - /* error handling if regular expression couldn't be compiled */ - int errmsgsz = regerror(ret, *regex, NULL, 0); - char *errmsg = malloc(errmsgsz); - if (errmsg == NULL) { - exit_sed(1, "sed: memory error\n"); - } - regerror(ret, *regex, errmsg, errmsgsz); - fprintf(stderr, "sed: %s\n", errmsg); - free(errmsg); + my_str[idx] = '\0'; + *regex = (regex_t *)xmalloc(sizeof(regex_t)); + if (bb_regcomp(*regex, my_str+1, REG_NEWLINE) != 0) { + free(my_str); exit_sed(1, NULL); } - my_str--; /* move my_str back so free() (below) won't barf */ - idx++; /* advance idx one past the end of the /match/ */ } else { fprintf(stderr, "sed.c:get_address: no address found in string\n"); @@ -280,6 +222,15 @@ static int get_address(const char *str, int *line, regex_t **regex) 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 void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr) { int idx = 0; @@ -306,10 +257,11 @@ static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr) sed_cmd->cmd = cmdstr[idx]; /* special-case handling for 's' */ if (sed_cmd->cmd == 's') { - int oldidx; + int oldidx, cflags = REG_NEWLINE; + char *match; /* format for substitution is: - * s/match/replace/g - * | | + * s/match/replace/gI + * | || * mandatory optional */ @@ -317,19 +269,41 @@ static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr) if (cmdstr[++idx] != '/') exit_sed(1, "sed: bad format in substitution expression\n"); - /* get the substitution part */ - idx += get_address(&cmdstr[idx], NULL, &sed_cmd->sub_match); + /* save the match string */ + oldidx = idx+1; + idx = index_of_next_unescaped_slash(idx, cmdstr); + if (idx == -1) + exit_sed(1, "sed: bad format in substitution expression\n"); + match = strdup_substr(cmdstr, oldidx, idx); - /* get the replacement part */ - oldidx = idx; + /* save the replacement string */ + oldidx = idx+1; idx = index_of_next_unescaped_slash(idx, cmdstr); - sed_cmd->replace = (char *)malloc(idx - oldidx + 1); - strncpy(sed_cmd->replace, &cmdstr[oldidx], idx - oldidx); - sed_cmd->replace[idx - oldidx] = 0; + if (idx == -1) + exit_sed(1, "sed: bad format in substitution expression\n"); + sed_cmd->replace = strdup_substr(cmdstr, oldidx, idx); - /* store the 'g' if present */ - if (cmdstr[++idx] == 'g') - sed_cmd->sub_g = 1; + /* process the flags */ + while (cmdstr[++idx]) { + switch (cmdstr[idx]) { + case 'g': + sed_cmd->sub_g = 1; + break; + case 'I': + cflags |= REG_ICASE; + break; + default: + exit_sed(1, "sed: bad option in substitution expression\n"); + } + } + + /* compile the regex */ + sed_cmd->sub_match = (regex_t *)xmalloc(sizeof(regex_t)); + if (bb_regcomp(sed_cmd->sub_match, match, cflags) != 0) { + free(match); + exit_sed(1, NULL); + } + free(match); } } @@ -553,10 +527,3 @@ extern int sed_main(int argc, char **argv) /* not reached */ return 0; } - -#ifdef TEST_SED -int main(int argc, char **argv) -{ - return sed_main(argc, argv); -} -#endif |