vob2srt.c

/* $VER: vob2srt.c v0.01 by Zeb (02-Jan-2019)
**
** Convert VobSub (IDX/SUB) subtitle files to SRT files
**
** Hopefully the first of many programming exercises of actual useful software
** to learn how to program in C. I'm using gcc on Linux before anyone asks!
*****************************************************************************/

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

//#define debug 1;

int strRight(char *src,char *trg, int intOffset);

char strSourceFile[64]={0},strTargetFile[64]={0};
char cmd[4];

int main(int argc,char *argv[]) {
  int i;
  for (i=1;i<argc;i++) {
    #ifdef debug
    printf("Pass %d: ",i);
    strncpy(cmd,argv[i],4); //Convert arg text to lower case, extract first 4 characters
    #endif
    if (strncmp(cmd,"-src",4)) { //source file specified
      strRight(argv[i],strSourceFile,4);
      #ifdef debug
      printf("Source '%s' copied\n",strSourceFile);
      #endif
    }
    if (strncmp(cmd,"-trg",4)) { //target file specified
      strRight(argv[i],strTargetFile,4);
      #ifdef debug
      printf("Target '%s' copied\n",strTargetFile);
      #endif
    }
  }
  return 0;
}

/* Similar to RIGHT$() in BASIC - copy src to trg from offset char until end
**
** Usage: src: source filename
**        trg: target filename
**        offset: where to start copying from
*****************************************************************************/
int strRight(char *src,char *trg,int intOffset) {
  int i=0;
  #ifdef debug
  int t=0;
  #endif
  if (intOffset<0 || intOffset>strlen(src)) {return 0;} //error - invalid offset
  #ifdef debug
  printf("strRight: src='%s', offset=%d\n",src,intOffset);
  #endif
  while (src[intOffset+i]!='\0') {
    #ifdef debug
    t=intOffset+i;
    printf("Character at position %d is %c\n",t,src[t]);
    #endif
    trg[i]=src[intOffset+i];
    i++;
  }
  return 1;
}