C Program/Script

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_LEN 257

int main(int argc, char *argv[])
{
    char line[MAX_LEN], *ptr;
    int c, i, l, n = 5;
    float t, tmin;
    FILE *fp;
    if (argc < 2)
    {
         printf("No otf filename\n");
         exit(0);
    }
    if ( (fp = fopen(argv[1], "r")) == NULL)
    {
         printf("Cannot open otf file %s\n", argv[1]);
         exit(0);
    }
    while (fgets(line, MAX_LEN, fp))
    {
        if (strstr(line, "smallest timesteps"))
        {
             sscanf(line, "%d", &n);
             if (n > 5) n = 5;
             tmin = 1.0e+20;
             fgets(line, MAX_LEN, fp);
             fgets(line, MAX_LEN, fp);
             for (i=0; i<n; i++)
             {
                 fgets(line, MAX_LEN, fp);
                 printf ("%s", line);
/* Remove any trailing characters */
                 l = strlen(line) - 1;
                 while ( (c = line[l]) == ' ' || c=='\n' || c=='\r' || c=='\t')
                     l--;
                 line[l+1] = '\0';
/* Find start of number */
                 l = strlen(line) - 1;
                 while ( (c = line[l]) != ' ')
                     l--;
                 ptr = &line[l];
                 sscanf(ptr, "%e", &t);
                 if (t < tmin)
                     tmin = t;
            }
            printf ("VAR TIMESTEP VALUE=\"%e\"\n", tmin);
            exit(0);
        }
    }
    fclose(fp);
}