diff options
| -rw-r--r-- | editors/Config.in | 9 | ||||
| -rw-r--r-- | editors/sed.c | 65 |
2 files changed, 64 insertions, 10 deletions
diff --git a/editors/Config.in b/editors/Config.in index 4f28175..c752677 100644 --- a/editors/Config.in +++ b/editors/Config.in @@ -24,6 +24,15 @@ config CONFIG_SED help Please submit a patch to add help text for this item. +config CONFIG_FEATURE_SED_EMBEDED_NEWLINE + bool " Embeded newline (EXPERIMENTAL)" + default n + depends on CONFIG_SED + help + This is a hack to allow matching of '\n' in regular expressions. + It works by translating '\n' to "\n" and back. + It may introduce unexpected results if you use "\n" in your text. + config CONFIG_VI bool "vi" default n diff --git a/editors/sed.c b/editors/sed.c index 1cbf974..292bc86 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -430,7 +430,7 @@ static char *parse_cmd_str(sed_cmd_t * const sed_cmd, char *cmdstr) static char *add_cmd(sed_cmd_t *sed_cmd, char *cmdstr) { - + /* Skip over leading whitespace and semicolons */ cmdstr += strspn(cmdstr, semicolon_whitespace); @@ -491,7 +491,6 @@ static char *add_cmd(sed_cmd_t *sed_cmd, char *cmdstr) cmdstr++; } #endif - } /* last part (mandatory) will be a command */ @@ -529,6 +528,18 @@ static char *add_cmd(sed_cmd_t *sed_cmd, char *cmdstr) static void add_cmd_str(char *cmdstr) { +#ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE + char *cmdstr_ptr = cmdstr; + + /* HACK: convert "\n" to match tranlated '\n' string */ + while((cmdstr_ptr = strstr(cmdstr_ptr, "\\n")) != NULL) { + cmdstr = xrealloc(cmdstr, strlen(cmdstr) + 2); + cmdstr_ptr = strstr(cmdstr, "\\n"); + memmove(cmdstr_ptr + 1, cmdstr_ptr, strlen(cmdstr_ptr) + 1); + cmdstr_ptr[0] = '\\'; + cmdstr_ptr += 3; + } +#endif do { sed_cmd_t *sed_cmd; sed_cmd = xcalloc(1, sizeof(sed_cmd_t)); @@ -795,8 +806,35 @@ static void process_file(FILE *file) * flag exists in the first place. */ +#ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE + /* HACK: escape newlines twice so regex can match them */ + { + int offset = 0; + while(strchr(line + offset, '\n') != NULL) { + char *tmp; + line = xrealloc(line, strlen(line) + 2); + tmp = strchr(line + offset, '\n'); + memmove(tmp + 1, tmp, strlen(tmp) + 1); + tmp[0] = '\\'; + tmp[1] = 'n'; + offset = tmp - line + 2; + } + } +#endif /* we print the line once, unless we were told to be quiet */ substituted = do_subst_command(sed_cmd, &line); + +#ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE + /* undo HACK: escape newlines twice so regex can match them */ + { + char *tmp = line; + + while((tmp = strstr(tmp, "\\n")) != NULL) { + memmove(tmp, tmp + 1, strlen(tmp + 1) + 1); + tmp[0] = '\n'; + } + } +#endif altered |= substituted; if (!be_quiet && altered && ((sed_cmd->linear == NULL) || (sed_cmd->linear->cmd != 's'))) { force_print = 1; @@ -857,11 +895,13 @@ static void process_file(FILE *file) linenum++; break; case 'N': /* Append the next line to the current line */ - line = realloc(line, strlen(line) + strlen(next_line) + 2); - strcat(line, "\n"); - strcat(line, next_line); - next_line = bb_get_chomped_line_from_file(file); - linenum++; + if (next_line) { + line = realloc(line, strlen(line) + strlen(next_line) + 2); + strcat(line, "\n"); + strcat(line, next_line); + next_line = bb_get_chomped_line_from_file(file); + linenum++; + } break; case 'b': sed_cmd = branch_to(sed_cmd->label); @@ -934,9 +974,12 @@ extern int sed_main(int argc, char **argv) case 'n': be_quiet++; break; - case 'e': - add_cmd_str(optarg); + case 'e': { + char *str_cmd = strdup(optarg); + add_cmd_str(str_cmd); + free(str_cmd); break; + } case 'f': load_cmd_file(optarg); break; @@ -951,7 +994,9 @@ extern int sed_main(int argc, char **argv) if (argv[optind] == NULL) bb_show_usage(); else { - add_cmd_str(argv[optind]); + char *str_cmd = strdup(argv[optind]); + add_cmd_str(strdup(str_cmd)); + free(str_cmd); optind++; } } |