src/main/common/string_light.c

   1 /*
   2  * This file is part of INAV.
   3  *
   4  * INAV 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 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * INAV is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with INAV.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <limits.h>
  19
  20 #include "string_light.h"
  21 #include "typeconversion.h"
  22
  23 int sl_isalnum(int c)
  24 {
  25     return sl_isdigit(c) || sl_isupper(c) || sl_islower(c);
  26 }
  27
  28 int sl_isdigit(int c)
  29 {
  30     return (c >= '0' && c <= '9');
  31 }
  32
  33 int sl_isupper(int c)
  34 {
  35     return (c >= 'A' && c <= 'Z');
  36 }
  37
  38 int sl_islower(int c)
  39 {
  40     return (c >= 'a' && c <= 'z');
  41 }
  42
  43 int sl_tolower(int c)
  44 {
  45     return sl_isupper(c) ? (c) - 'A' + 'a' : c;
  46 }
  47
  48 int sl_toupper(int c)
  49 {
  50     return sl_islower(c) ? (c) - 'a' + 'A' : c;
  51 }
  52
  53 int sl_strcasecmp(const char * s1, const char * s2)
  54 {
  55     return sl_strncasecmp(s1, s2, INT_MAX);
  56 }
  57
  58 int sl_strncasecmp(const char * s1, const char * s2, int n)
  59 {
  60     const unsigned char * ucs1 = (const unsigned char *) s1;
  61     const unsigned char * ucs2 = (const unsigned char *) s2;
  62
  63     int d = 0;
  64
  65     for ( ; n != 0; n--) {
  66         const int c1 = sl_tolower(*ucs1++);
  67         const int c2 = sl_tolower(*ucs2++);
  68         if (((d = c1 - c2) != 0) || (c2 == '\0')) {
  69             break;
  70         }
  71     }
  72
  73     return d;
  74 }