auto-gid.c

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#include <unistd.h>
#include <sys/types.h>
#include <grp.h>
#include "buffer.h"
#include "exit.h"
#include "scan.h"
#include "fmt.h"
 
char inbuf[256];
buffer b = BUFFER_INIT(write,1,inbuf,sizeof(inbuf));
 
void outs(char *s)
{
  if (buffer_puts(&b,s) == -1) _exit(111);
}
 
int main(int argc, char **argv)
{
  char *name;
  char *value;
  struct group *gr;
  char strnum[FMT_ULONG];
 
  name = argv[1];
  if (!name) _exit(100);
  value = argv[2];
  if (!value) _exit(100);
 
  gr = getgrnam(value);
  if (!gr) {
    buffer_puts(buffer_2,"fatal: unable to find group ");
    buffer_puts(buffer_2,value);
    buffer_puts(buffer_2,"\n");
    buffer_flush(buffer_2);
    _exit(111);
  }
 
  strnum[fmt_ulong(strnum,(unsigned long) gr->gr_gid)] = 0;
 
  outs("int ");
  outs(name);
  outs(" = ");
  outs(strnum);
  outs(";\n");
  if (buffer_flush(&b) == -1) _exit(111);
  _exit(0);
}