gitutil.c

   1 /*
   2  *  Copyright © 2006 Keith Packard <keithp@keithp.com>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or (at
   7  *  your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful, but
  10  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include "cvs.h"
  20
  21 int
  22 git_system (char *command)
  23 {
  24     int ret = 0;
  25
  26 /*    printf ("\t%s\n", command); */
  27 #if 1
  28     ret = system (command);
  29     if (ret != 0) {
  30         fprintf (stderr, "%s failed\n", command);
  31     }
  32 #endif
  33     return ret;
  34 }
  35
  36 char *
  37 git_system_to_string (char *command)
  38 {
  39     FILE    *f;
  40     char    buf[1024];
  41     char    *nl;
  42
  43     f = popen (command, "r");
  44     if (!f) {
  45         fprintf (stderr, "%s: %s\n", command, strerror (errno));
  46         return NULL;
  47     }
  48     if (fgets (buf, sizeof (buf), f) == NULL) {
  49         fprintf (stderr, "%s: %s\n", command, strerror (errno));
  50         pclose (f);
  51         return NULL;
  52     }
  53     while (getc (f) != EOF)
  54         ;
  55     pclose (f);
  56     nl = strchr (buf, '\n');
  57     if (nl)
  58         *nl = '\0';
  59     return atom (buf);
  60 }
  61
  62 int
  63 git_string_to_system (char *command, char *string)
  64 {
  65     FILE    *f;
  66
  67     f = popen (command, "w");
  68     if (!f) {
  69         fprintf (stderr, "%s: %s\n", command, strerror (errno));
  70         return -1;
  71     }
  72     if (fputs (string, f) == EOF) {
  73         fprintf (stderr, "%s: %s\n", command, strerror (errno));
  74         pclose (f);
  75         return -1;
  76     }
  77     pclose (f);
  78     return 0;
  79 }
  80
  81 char *
  82 git_format_command (const char *fmt, ...)
  83 {
  84     /* Guess we need no more than 100 bytes. */
  85     int n, size = 100;
  86     char *p, *np;
  87     va_list ap;
  88
  89     if ((p = malloc (size)) == NULL)
  90         return NULL;
  91
  92     while (1) {
  93         /* Try to print in the allocated space. */
  94         va_start(ap, fmt);
  95         n = vsnprintf (p, size, fmt, ap);
  96         va_end(ap);
  97         /* If that worked, return the string. */
  98         if (n > -1 && n < size)
  99             return p;
 100         /* Else try again with more space. */
 101         if (n > -1)    /* glibc 2.1 */
 102         size = n+1; /* precisely what is needed */
 103         else           /* glibc 2.0 */
 104         size *= 2;  /* twice the old size */
 105         if ((np = realloc (p, size)) == NULL) {
 106             free(p);
 107             return NULL;
 108         } else {
 109             p = np;
 110         }
 111     }
 112 }