text-utils/line.c

   1 /*
   2  * line - read one line
   3  *
   4  * Gunnar Ritter, Freiburg i. Br., Germany, December 2000.
   5  *
   6  * Public Domain.
   7  */
   8
   9 /*
  10  * This command is deprecated.  The utility is in maintenance mode,
  11  * meaning we keep them in source tree for backward compatibility
  12  * only.  Do not waste time making this command better, unless the
  13  * fix is about security or other very critical issue.
  14  *
  15  * See Documentation/deprecated.txt for more information.
  16  */
  17
  18 #include <getopt.h>
  19 #include <stdio.h>
  20 #include <unistd.h>
  21
  22 #include "c.h"
  23 #include "closestream.h"
  24 #include "nls.h"
  25 #include "widechar.h"
  26
  27 static void __attribute__((__noreturn__)) usage(FILE *out)
  28 {
  29         fputs(USAGE_HEADER, out);
  30         fprintf(out, _(" %s [options]\n"), program_invocation_short_name);
  31
  32         fputs(USAGE_SEPARATOR, out);
  33         fputs(_("Read one line.\n"), out);
  34
  35         fputs(USAGE_OPTIONS, out);
  36         fputs(USAGE_HELP, out);
  37         fputs(USAGE_VERSION, out);
  38         fprintf(out, USAGE_MAN_TAIL("line(1)"));
  39         exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
  40 }
  41
  42 int main(int argc, char **argv)
  43 {
  44         wint_t c;
  45         int opt;
  46         int status = EXIT_SUCCESS;
  47
  48         static const struct option longopts[] = {
  49                 {"version", no_argument, NULL, 'V'},
  50                 {"help", no_argument, NULL, 'h'},
  51                 {NULL, 0, NULL, 0}
  52         };
  53
  54         setlocale(LC_ALL, "");
  55         bindtextdomain(PACKAGE, LOCALEDIR);
  56         textdomain(PACKAGE);
  57         atexit(close_stdout);
  58
  59         while ((opt = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
  60                 switch (opt) {
  61                 case 'V':
  62                         printf(UTIL_LINUX_VERSION);
  63                         return EXIT_SUCCESS;
  64                 case 'h':
  65                         usage(stdout);
  66                 default:
  67                         errtryhelp(EXIT_FAILURE);
  68                 }
  69
  70         setvbuf(stdin, NULL, _IONBF, 0);
  71         for (;;) {
  72                 c = getwchar();
  73                 if (c == WEOF) {
  74                         status = EXIT_FAILURE;
  75                         break;
  76                 }
  77                 if (c == '\n')
  78                         break;
  79                 putwchar(c);
  80         }
  81         putwchar(L'\n');
  82
  83         return status;
  84 }