#include <stdio.h>

int getnumber(void);
void writeavs(int, int, int);

int main(void) {
    int i, last, n;

    i = 1;
    last = 0;
    printf("Input all frame numbers and end with Ctrl+D\n");
    while ((n = getnumber()) != EOF) {
        writeavs(i++, last, n - 1);
        last = n;
    }
    writeavs(i, last, EOF);

    return 0;
}

#include <stdlib.h>
#define MAXNUM 100
#define EOT    4 /* end of transmission: ctrl+d */

/* getnumber: read one whole number from input */
int getnumber(void) {
    int c;
    char s[MAXNUM], *p;

    for (p = s; (c = getchar()) != '\n' && c != EOT; p++)
        *p = c;
    *p = '\0';

    return c == EOT ? EOF : atoi(s);
}

/* writeavs: create the avs script file */
void writeavs(int part, int start, int end) {
    FILE *fp;
    char filename[11]; // partNN.avs

    sprintf(filename, "part%02d.avs", part);
    fp = fopen(filename, "w");

    fprintf(fp, "AviSource(\"input.avs\") Trim(%d, ", start);
    if (end == EOF)
        fprintf(fp, "last.FrameCount)");
    else
        fprintf(fp, "%d)", end);

    fclose(fp);
}