ustctl/scanning_functions.c

   1 /* Copyright (C) 2011  Ericsson AB, Nils Carlson <nils.carlson@ericsson.com>
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <stdio.h>
  20 #include <ust/ustctl.h>
  21 #include "usterr.h"
  22
  23
  24 pid_t parse_pid(const char *pid_string)
  25 {
  26         pid_t pid;
  27
  28         errno = 0;
  29         pid = strtoull(pid_string, NULL, 10);
  30         if (errno) {
  31                 perror("Failed to parse pid");
  32                 exit(EXIT_FAILURE);
  33         }
  34
  35         return pid;
  36 }
  37
  38 int scan_ch_marker(const char *channel_marker, char **channel, char **marker)
  39 {
  40         int result;
  41
  42         *channel = NULL;
  43         *marker = NULL;
  44
  45         result = sscanf(channel_marker, "%a[^/]/%as", channel, marker);
  46         if (result != 2) {
  47                 if (errno) {
  48                         PERROR("Failed to read channel and marker names");
  49                 } else {
  50                         ERR("Failed to parse marker and channel names");
  51                 }
  52                 if (*channel) {
  53                         free(*channel);
  54                 }
  55                 if (*marker) {
  56                         free(*marker);
  57                 }
  58                 return -1;
  59         }
  60
  61         return 0;
  62 }
  63
  64 int scan_ch_and_num(const char *ch_num, char **channel, unsigned int *num)
  65 {
  66         int result;
  67
  68         *channel = NULL;
  69
  70         result = sscanf(ch_num, "%a[^/]/%u", channel, num);
  71         if (result != 2) {
  72                 if (errno) {
  73                         PERROR("Failed to parse channel and number");
  74                 } else {
  75                         ERR("Failed to parse channel and number");
  76                 }
  77                 if (*channel) {
  78                         free(*channel);
  79                 }
  80                 return -1;
  81         }
  82
  83         return 0;
  84 }