/* 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 (4.5 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-$(CONFIG_PASTE) += paste.o //usage:#define paste_trivial_usage //usage: "[OPTIONS] [FILE]..." //usage:#define paste_full_usage "\n\n" //usage: "Paste lines from each input file, separated with tab\n" //usage: "\n -d LIST Use delimiters from LIST, not tab" //usage: "\n -s Serial: one file at a time" //usage: //usage:#define paste_example_usage //usage: "# write out directory in four columns\n" //usage: "$ 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_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); }