src/lxc/parse.c

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <daniel.lezcano at free.fr>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23 #define _GNU_SOURCE
  24 #include <stdio.h>
  25 #undef _GNU_SOURCE
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30
  31 #include "parse.h"
  32 #include "config.h"
  33 #include "utils.h"
  34 #include "log.h"
  35
  36 lxc_log_define(lxc_parse, lxc);
  37
  38 int lxc_file_for_each_line(const char *file, lxc_file_cb callback, void *data)
  39 {
  40         FILE *f;
  41         int err = 0;
  42         char *line = NULL;
  43         size_t len = 0;
  44
  45         f = fopen(file, "r");
  46         if (!f) {
  47                 SYSERROR("failed to open %s", file);
  48                 return -1;
  49         }
  50
  51         while (getline(&line, &len, f) != -1) {
  52                 err = callback(line, data);
  53                 if (err) {
  54                         /* Callback rv > 0 means stop here callback rv < 0 means
  55                          * error.
  56                          */
  57                         if (err < 0)
  58                                 ERROR("Failed to parse config: %s", line);
  59                         break;
  60                 }
  61         }
  62
  63         free(line);
  64         fclose(f);
  65         return err;
  66 }
  67
  68 int lxc_char_left_gc(const char *buffer, size_t len)
  69 {
  70         size_t i;
  71         for (i = 0; i < len; i++) {
  72                 if (buffer[i] == ' ' ||
  73                     buffer[i] == '\t')
  74                         continue;
  75                 return i;
  76         }
  77         return 0;
  78 }
  79
  80 int lxc_char_right_gc(const char *buffer, size_t len)
  81 {
  82         int i;
  83         for (i = len - 1; i >= 0; i--) {
  84                 if (buffer[i] == ' '  ||
  85                     buffer[i] == '\t' ||
  86                     buffer[i] == '\n' ||
  87                     buffer[i] == '\0')
  88                         continue;
  89                 return i + 1;
  90         }
  91         return 0;
  92 }
  93
  94 int lxc_is_line_empty(const char *line)
  95 {
  96         int i;
  97         size_t len = strlen(line);
  98
  99         for (i = 0; i < len; i++)
 100                 if (line[i] != ' ' && line[i] != '\t' &&
 101                     line[i] != '\n' && line[i] != '\r' &&
 102                     line[i] != '\f' && line[i] != '\0')
 103                         return 0;
 104         return 1;
 105 }