util.c

/*
 * (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
 * (C)opyright MMVII Robert Manea <rob dot manea  at gmail dot com>
 * See LICENSE file for license details.
 *
 */

#include "nezd.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>

#define ONEMASK ((size_t)(-1) / 0xFF)

void *emalloc(unsigned int size) {
  void *res = malloc(size);

  if (!res)
    eprint("fatal: could not malloc() %u bytes\n", size);
  return res;
}

void eprint(const char *errstr, ...) {
  va_list ap;

  va_start(ap, errstr);
  vfprintf(stderr, errstr, ap);
  va_end(ap);
  exit(EXIT_FAILURE);
}

char *estrdup(const char *str) {
  void *res = strdup(str);

  if (!res)
    eprint("fatal: could not malloc() %u bytes\n", strlen(str));
  return res;
}
void spawn(const char *arg) {
  static const char *shell = NULL;

  if (!shell && !(shell = getenv("SHELL")))
    shell = "/bin/sh";
  if (!arg)
    return;
  /* The double-fork construct avoids zombie processes and keeps the code
   * clean from stupid signal handlers. */
  if (fork() == 0) {
    if (fork() == 0) {
      setsid();
      execl(shell, shell, "-c", arg, (char *)NULL);
      fprintf(stderr, "nezd: execl '%s -c %s'", shell, arg);
      perror(" failed");
    }
    exit(0);
  }
  wait(0);
}