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C language: split lines by tabs (strsep() and fgets() usage)

Subject: show how to split lines by tabs using strsep() and fgets() function calls in C-language (C99).

Usage: compile source C-code with GCC (M$ Visual Studio does not support strsep() function call)
and run it with one option: the name of file (like <the name of program> <the name of file>).

//------- the start of the C code -------
* Author: Stepan A. Baranov (
* web-site:

#include <stdio.h>
#include <limits.h>
#include <string.h>

#define B_S 1
#define G_S 0

main (int argc, const char *argv[])
  int i = 1, j = 1;
  char line[LINE_MAX], *templine, *linePtr;
  FILE *fp;
  fp = fopen (argv[1], "rb");
  if (fp == NULL) return B_S;
  fseek (fp, 0, SEEK_SET);
  while (fgets (line, LINE_MAX, fp) != NULL) {
    printf ("line %i: %s", i++, line);
    linePtr = line;
    linePtr = strsep (&linePtr, "\n");
    while ((templine = strsep (&linePtr, "\t")) != NULL)
      printf ("(%i: %s) ", j++, templine);
    printf ("\n");
    j = 1;
  return G_S;
//------- the end of the C code -------

©2009 Rosmir - Stepan A. Baranov
$Id: strsep-fgets.html 413 2009-01-06 21:16:05Z rosmir $