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/* vi: set sw=4 ts=4: */
/*
* paste.c - implementation of the posix paste command
*
* Written by Maxime Coste <mawww@kakoune.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config PASTE
//config: bool "paste (4.9 kb)"
//config: default y
//config: help
//config: paste is used to paste lines of different files together
//config: and write the result to stdout
//applet:IF_PASTE(APPLET_NOEXEC(paste, paste, BB_DIR_USR_BIN, BB_SUID_DROP, paste))
//kbuild:lib-$(CONFIG_PASTE) += paste.o
//usage:#define paste_trivial_usage
//usage: "[-d LIST] [-s] [FILE]..."
//usage:#define paste_full_usage "\n\n"
//usage: "Paste lines from each input file, separated with tab\n"
//usage: "\n -d LIST Use delimiters from LIST, not tab"
//usage: "\n -s Serial: one file at a time"
//usage:
//usage:#define paste_example_usage
//usage: "# write out directory in four columns\n"
//usage: "$ ls | paste - - - -\n"
//usage: "# combine pairs of lines from a file into single lines\n"
//usage: "$ paste -s -d '\\t\\n' file\n"
#include "libbb.h"
static void paste_files(FILE** files, int file_cnt, char* delims, int del_cnt)
{
char *line;
char delim;
int active_files = file_cnt;
int i;
while (active_files > 0) {
int del_idx = 0;
for (i = 0; i < file_cnt; ++i) {
if (files[i] == NULL)
continue;
line = xmalloc_fgetline(files[i]);
if (!line) {
fclose_if_not_stdin(files[i]);
files[i] = NULL;
--active_files;
continue;
}
fputs(line, stdout);
free(line);
delim = '\n';
if (i != file_cnt - 1) {
delim = delims[del_idx++];
if (del_idx == del_cnt)
del_idx = 0;
}
if (delim != '\0')
fputc(delim, stdout);
}
}
}
static void paste_files_separate(FILE** files, char* delims, int del_cnt)
{
char *line, *next_line;
char delim;
int i;
for (i = 0; files[i]; ++i) {
int del_idx = 0;
line = NULL;
while ((next_line = xmalloc_fgetline(files[i])) != NULL) {
if (line) {
fputs(line, stdout);
free(line);
delim = delims[del_idx++];
if (del_idx == del_cnt)
del_idx = 0;
if (delim != '\0')
fputc(delim, stdout);
}
line = next_line;
}
if (line) {
/* coreutils adds \n even if this is a final line
* of the last file and it was not \n-terminated.
*/
printf("%s\n", line);
free(line);
}
fclose_if_not_stdin(files[i]);
}
}
#define PASTE_OPT_DELIMITERS (1 << 0)
#define PASTE_OPT_SEPARATE (1 << 1)
int paste_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int paste_main(int argc UNUSED_PARAM, char **argv)
{
char *delims = (char*)"\t";
int del_cnt = 1;
unsigned opt;
int i;
opt = getopt32(argv, "d:s", &delims);
argv += optind;
if (opt & PASTE_OPT_DELIMITERS) {
if (!delims[0])
bb_simple_error_msg_and_die("-d '' is not supported");
/* unknown mappings are not changed: "\z" -> '\\' 'z' */
/* trailing backslash, if any, is preserved */
del_cnt = strcpy_and_process_escape_sequences(delims, delims) - delims;
/* note: handle NUL properly (do not stop at it!): try -d'\t\0\t' */
}
if (!argv[0])
(--argv)[0] = (char*) "-";
for (i = 0; argv[i]; ++i) {
argv[i] = (void*) fopen_or_warn_stdin(argv[i]);
if (!argv[i])
xfunc_die();
}
if (opt & PASTE_OPT_SEPARATE)
paste_files_separate((FILE**)argv, delims, del_cnt);
else
paste_files((FILE**)argv, i, delims, del_cnt);
fflush_stdout_and_exit(0);
}
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