libbb/print_numbered_lines.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
   4  *
   5  * Licensed under GPLv2, see file LICENSE in this source tree.
   6  */
   7 //kbuild:lib-y += print_numbered_lines.o
   8
   9 #include "libbb.h"
  10
  11 int FAST_FUNC print_numbered_lines(struct number_state *ns, const char *filename)
  12 {
  13         FILE *fp = fopen_or_warn_stdin(filename);
  14         unsigned N;
  15         char *line;
  16
  17         if (!fp)
  18                 return EXIT_FAILURE;
  19
  20         N = ns->start;
  21         while ((line = xmalloc_fgetline(fp)) != NULL) {
  22                 if (ns->all
  23                  || (ns->nonempty && line[0])
  24                 ) {
  25                         printf("%*u%s%s\n", ns->width, N, ns->sep, line);
  26                         N += ns->inc;
  27                 } else if (ns->empty_str)
  28                         fputs(ns->empty_str, stdout);
  29                 free(line);
  30         }
  31         ns->start = N;
  32
  33         fclose(fp);
  34
  35         return EXIT_SUCCESS;
  36 }