src/main/common/string_light.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <limits.h>
  22 #include <ctype.h>
  23 #include <string.h>
  24
  25 #include "platform.h"
  26
  27 #include "typeconversion.h"
  28
  29 int isalnum(int c)
  30 {
  31     return isdigit(c) || isupper(c) || islower(c);
  32 }
  33
  34 int isdigit(int c)
  35 {
  36     return (c >= '0' && c <= '9');
  37 }
  38
  39 int isupper(int c)
  40 {
  41     return (c >= 'A' && c <= 'Z');
  42 }
  43
  44 int islower(int c)
  45 {
  46     return (c >= 'a' && c <= 'z');
  47 }
  48
  49 int isspace(int c)
  50 {
  51     return (c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v');
  52 }
  53
  54 int tolower(int c)
  55 {
  56     return isupper(c) ? (c) - 'A' + 'a' : c;
  57 }
  58
  59 int toupper(int c)
  60 {
  61     return islower(c) ? (c) - 'a' + 'A' : c;
  62 }
  63
  64 int strcasecmp(const char * s1, const char * s2)
  65 {
  66     return strncasecmp(s1, s2, (size_t)INT_MAX);
  67 }
  68
  69 int strncasecmp(const char * s1, const char * s2, size_t n)
  70 {
  71     const unsigned char * ucs1 = (const unsigned char *) s1;
  72     const unsigned char * ucs2 = (const unsigned char *) s2;
  73
  74     int d = 0;
  75
  76     for ( ; n != 0; n--) {
  77         const int c1 = tolower(*ucs1++);
  78         const int c2 = tolower(*ucs2++);
  79         if (((d = c1 - c2) != 0) || (c2 == '\0')) {
  80             break;
  81         }
  82     }
  83
  84     return d;
  85 }
  86
  87 char *strcasestr(const char *haystack, const char *needle)
  88 {
  89     int nLen = strlen(needle);
  90     do {
  91         if (!strncasecmp(haystack, needle, nLen)) {
  92             return (char *)haystack;
  93         }
  94         haystack++;
  95     } while (*haystack);
  96     return NULL;
  97 }