src/lxc/parse.c

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <dlezcano at fr.ibm.com>
   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <lxc/log.h>
  33
  34 lxc_log_define(lxc_parse, lxc);
  35
  36 static int dir_filter(const struct dirent *dirent)
  37 {
  38         if (!strcmp(dirent->d_name, ".") ||
  39             !strcmp(dirent->d_name, ".."))
  40                 return 0;
  41         return 1;
  42 }
  43
  44 int lxc_dir_for_each(const char *name, const char *directory,
  45                      lxc_dir_cb callback, void *data)
  46 {
  47         struct dirent **namelist;
  48         int n, ret = 0;
  49
  50         n = scandir(directory, &namelist, dir_filter, alphasort);
  51         if (n < 0) {
  52                 SYSERROR("failed to scan %s directory", directory);
  53                 return -1;
  54         }
  55
  56         while (n--) {
  57                 if (!ret &&
  58                     callback(name, directory, namelist[n]->d_name, data)) {
  59                         ERROR("callback failed");
  60                         ret = -1;
  61                 }
  62                 free(namelist[n]);
  63         }
  64         free(namelist);
  65
  66         return ret;
  67 }
  68
  69 int lxc_file_for_each_line(const char *file, lxc_file_cb callback, void *data)
  70 {
  71         FILE *f;
  72         int err = 0;
  73         char *line = NULL;
  74         size_t len = 0;
  75
  76         f = fopen(file, "r");
  77         if (!f) {
  78                 SYSERROR("failed to open %s", file);
  79                 return -1;
  80         }
  81
  82         while (getline(&line, &len, f) != -1) {
  83                 err = callback(line, data);
  84                 if (err) {
  85                         ERROR("failed to process '%s'", line);
  86                         break;
  87                 }
  88         }
  89
  90         if (line)
  91                 free(line);
  92         fclose(f);
  93         return err;
  94 }
  95
  96 int lxc_char_left_gc(char *buffer, size_t len)
  97 {
  98         int i;
  99         for (i = 0; i < len; i++) {
 100                 if (buffer[i] == ' ' ||
 101                     buffer[i] == '\t')
 102                         continue;
 103                 return i;
 104         }
 105         return 0;
 106 }
 107
 108 int lxc_char_right_gc(char *buffer, size_t len)
 109 {
 110         int i;
 111         for (i = len - 1; i >= 0; i--) {
 112                 if (buffer[i] == ' '  ||
 113                     buffer[i] == '\t' ||
 114                     buffer[i] == '\n' ||
 115                     buffer[i] == '\0')
 116                         continue;
 117                 return i + 1;
 118         }
 119         return 0;
 120 }
 121
 122 int lxc_is_line_empty(char *line)
 123 {
 124         int i;
 125         size_t len = strlen(line);
 126
 127         for (i = 0; i < len; i++)
 128                 if (line[i] != ' ' && line[i] != '\t' &&
 129                     line[i] != '\n' && line[i] != '\r' &&
 130                     line[i] != '\f' && line[i] != '\0')
 131                         return 0;
 132         return 1;
 133 }