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141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* paste.c - implementation of the posix paste command
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*
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* Written by Maxime Coste <mawww@kakoune.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config PASTE
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//config: bool "paste"
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//config: default y
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//config: help
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//config: paste is used to paste lines of different files together
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//config: and write the result to stdout
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//applet:IF_PASTE(APPLET_NOEXEC(paste, paste, BB_DIR_USR_BIN, BB_SUID_DROP, paste))
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//kbuild:lib-$(CONFIG_PASTE) += paste.o
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//usage:#define paste_trivial_usage
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//usage: "[OPTIONS] [FILE]..."
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//usage:#define paste_full_usage "\n\n"
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//usage: "Paste lines from each input file, separated with tab\n"
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//usage: "\n -d LIST Use delimiters from LIST, not tab"
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//usage: "\n -s Serial: one file at a time"
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//usage:
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//usage:#define paste_example_usage
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//usage: "# write out directory in four columns\n"
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//usage: "$ ls | paste - - - -\n"
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//usage: "# combine pairs of lines from a file into single lines\n"
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//usage: "$ paste -s -d '\\t\\n' file\n"
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#include "libbb.h"
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static void paste_files(FILE** files, int file_cnt, char* delims, int del_cnt)
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{
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char *line;
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char delim;
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int active_files = file_cnt;
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int i;
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while (active_files > 0) {
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int del_idx = 0;
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for (i = 0; i < file_cnt; ++i) {
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if (files[i] == NULL)
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continue;
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line = xmalloc_fgetline(files[i]);
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if (!line) {
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fclose_if_not_stdin(files[i]);
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files[i] = NULL;
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--active_files;
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continue;
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}
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fputs(line, stdout);
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free(line);
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delim = '\n';
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if (i != file_cnt - 1) {
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delim = delims[del_idx++];
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if (del_idx == del_cnt)
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del_idx = 0;
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}
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if (delim != '\0')
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fputc(delim, stdout);
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}
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}
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}
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static void paste_files_separate(FILE** files, char* delims, int del_cnt)
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{
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char *line, *next_line;
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char delim;
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int i;
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for (i = 0; files[i]; ++i) {
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int del_idx = 0;
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line = NULL;
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while ((next_line = xmalloc_fgetline(files[i])) != NULL) {
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if (line) {
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fputs(line, stdout);
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free(line);
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delim = delims[del_idx++];
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if (del_idx == del_cnt)
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del_idx = 0;
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if (delim != '\0')
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fputc(delim, stdout);
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}
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line = next_line;
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}
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if (line) {
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/* coreutils adds \n even if this is a final line
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* of the last file and it was not \n-terminated.
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*/
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printf("%s\n", line);
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free(line);
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}
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fclose_if_not_stdin(files[i]);
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}
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}
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#define PASTE_OPT_DELIMITERS (1 << 0)
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#define PASTE_OPT_SEPARATE (1 << 1)
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int paste_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int paste_main(int argc UNUSED_PARAM, char **argv)
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{
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char *delims = (char*)"\t";
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int del_cnt = 1;
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unsigned opt;
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int i;
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opt = getopt32(argv, "d:s", &delims);
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argv += optind;
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if (opt & PASTE_OPT_DELIMITERS) {
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if (!delims[0])
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bb_error_msg_and_die("-d '' is not supported");
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/* unknown mappings are not changed: "\z" -> '\\' 'z' */
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/* trailing backslash, if any, is preserved */
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del_cnt = strcpy_and_process_escape_sequences(delims, delims) - delims;
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/* note: handle NUL properly (do not stop at it!): try -d'\t\0\t' */
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}
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if (!argv[0])
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(--argv)[0] = (char*) "-";
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for (i = 0; argv[i]; ++i) {
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argv[i] = (void*) fopen_or_warn_stdin(argv[i]);
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if (!argv[i])
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xfunc_die();
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}
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if (opt & PASTE_OPT_SEPARATE)
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paste_files_separate((FILE**)argv, delims, del_cnt);
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else
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paste_files((FILE**)argv, i, delims, del_cnt);
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fflush_stdout_and_exit(0);
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}
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