cpp.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <libgen.h>
   4
   5 #include "cpp.h"
   6 #include "str.h"
   7 #include "proc.h"
   8 #include "xmalloc.h"
   9
  10 static size_t argv_len(char *const argv[])
  11 {
  12         size_t len = 0;
  13
  14         for (; argv && *argv; argv++)
  15                 len++;
  16
  17         return len;
  18 }
  19
  20 int cpp_exec(char *in_file, char *out_file, size_t out_len, char *const argv[])
  21 {
  22         size_t argc = 7 + argv_len(argv);
  23         char *tmp = xstrdup(in_file);
  24         char **cpp_argv;
  25         int fd, ret = -1;
  26         char *base;
  27         unsigned int i = 0;
  28
  29         base = basename(tmp);
  30         slprintf(out_file, out_len, "/tmp/.tmp-XXXXXX-%s", base);
  31         fd = mkstemps(out_file, strlen(base) + 1);
  32         if (fd < 0)
  33                 goto err;
  34
  35         cpp_argv = xmalloc(argc * sizeof(char *));
  36
  37         cpp_argv[i++] = "cpp";
  38
  39         for (; argv && *argv; argv++, i++)
  40                 cpp_argv[i] = *argv;
  41
  42         cpp_argv[i++] = "-I";
  43         cpp_argv[i++] = ETCDIRE_STRING;
  44         cpp_argv[i++] = "-o";
  45         cpp_argv[i++] = out_file;
  46         cpp_argv[i++] = in_file;
  47         cpp_argv[i++] = NULL;
  48
  49         ret = proc_exec("cpp", cpp_argv);
  50         close(fd);
  51
  52         xfree(cpp_argv);
  53 err:
  54         xfree(tmp);
  55         return ret;
  56 }