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.h"
  21 #include "string_light.h"
  22 #include "typeconversion.h"
  23
  24 int sl_isalnum(int c)
  25 {
  26     return sl_isdigit(c) || sl_isupper(c) || sl_islower(c);
  27 }
  28
  29 int sl_isdigit(int c)
  30 {
  31     return (c >= '0' && c <= '9');
  32 }
  33
  34 int sl_isupper(int c)
  35 {
  36     return (c >= 'A' && c <= 'Z');
  37 }
  38
  39 int sl_islower(int c)
  40 {
  41     return (c >= 'a' && c <= 'z');
  42 }
  43
  44 int sl_tolower(int c)
  45 {
  46     return sl_isupper(c) ? (c) - 'A' + 'a' : c;
  47 }
  48
  49 int sl_toupper(int c)
  50 {
  51     return sl_islower(c) ? (c) - 'a' + 'A' : c;
  52 }
  53
  54 void sl_toupperptr(char * c)
  55 {
  56     for (unsigned int i = 0; i < strlen(c); i++) {
  57         if (c[i] >= 'a' && c[i] <= 'z') {
  58            c[i] = c[i] - 'a' + 'A';
  59         }
  60     }
  61 }
  62
  63 int sl_strcasecmp(const char * s1, const char * s2)
  64 {
  65     return sl_strncasecmp(s1, s2, INT_MAX);
  66 }
  67
  68 int sl_strncasecmp(const char * s1, const char * s2, int n)
  69 {
  70     const unsigned char * ucs1 = (const unsigned char *) s1;
  71     const unsigned char * ucs2 = (const unsigned char *) s2;
  72
  73     int d = 0;
  74
  75     for ( ; n != 0; n--) {
  76         const int c1 = sl_tolower(*ucs1++);
  77         const int c2 = sl_tolower(*ucs2++);
  78         if (((d = c1 - c2) != 0) || (c2 == '\0')) {
  79             break;
  80         }
  81     }
  82
  83     return d;
  84 }