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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define F "data.txt"
static void purge(FILE *fp)
{
int c;
while ((c = fgetc(fp)) != '\n' && c != EOF)
{
}
}
static void clean (char *s, FILE *fp)
{
/* search ... */
char *p = strchr (s, '\n'); /* <string.h> */
if (p != NULL)
{
/* ... and kill */
*p = 0;
}
else
{
purge (fp);
}
}
int main()
{
FILE *fp = fopen(F, "r");
if (fp != NULL)
{
char line[BUFSIZ];
/* skip the first line */
if (fgets(line, sizeof line, fp) != NULL)
{
clean(line, fp);
/* read the other lines */
while (fgets(line, sizeof line, fp) != NULL)
{
clean(line, fp);
/* skip the first collumn */
char *p = strtok(line, " ");
if (p != NULL)
{
p = strtok(NULL, " ");
if (p != NULL)
{
int ip[4];
sscanf(p, "%d.%d.%d.%d", ip, ip + 1, ip + 2, ip + 3);
printf ("%3d %3d %3d %3d\n", ip[0], ip[1], ip[2], ip[3]);
}
else
{
printf ("format error\n");
break;
}
}
else
{
printf ("format error\n");
break;
}
}
}
fclose (fp), fp = NULL;
}
else
{
perror (F);
}
assert (fp == NULL);
return 0;
} |
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