src/main/common/string_light.c

   1 /*
   2  * This file is part of Cleanflight.
   3  *
   4  * Cleanflight 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  * Cleanflight 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 Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <limits.h>
  19 #include <ctype.h>
  20 #include <string.h>
  21
  22 #include "typeconversion.h"
  23
  24 int isalnum(int c)
  25 {
  26     return isdigit(c) || isupper(c) || islower(c);
  27 }
  28
  29 int isdigit(int c)
  30 {
  31     return (c >= '0' && c <= '9');
  32 }
  33
  34 int isupper(int c)
  35 {
  36     return (c >= 'A' && c <= 'Z');
  37 }
  38
  39 int islower(int c)
  40 {
  41     return (c >= 'a' && c <= 'z');
  42 }
  43
  44 int isspace(int c)
  45 {
  46     return (c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v');
  47 }
  48
  49 int tolower(int c)
  50 {
  51     return isupper(c) ? (c) - 'A' + 'a' : c;
  52 }
  53
  54 int toupper(int c)
  55 {
  56     return islower(c) ? (c) - 'a' + 'A' : c;
  57 }
  58
  59 int strcasecmp(const char * s1, const char * s2)
  60 {
  61     return strncasecmp(s1, s2, (size_t)-1);
  62 }
  63
  64 int strncasecmp(const char * s1, const char * s2, size_t n)
  65 {
  66     const unsigned char * ucs1 = (const unsigned char *) s1;
  67     const unsigned char * ucs2 = (const unsigned char *) s2;
  68
  69     int d = 0;
  70
  71     for ( ; n != 0; n--) {
  72         const int c1 = tolower(*ucs1++);
  73         const int c2 = tolower(*ucs2++);
  74         if (((d = c1 - c2) != 0) || (c2 == '\0')) {
  75             break;
  76         }
  77     }
  78
  79     return d;
  80 }
  81
  82 char *strcasestr(const char *haystack, const char *needle)
  83 {
  84     int nLen = strlen(needle);
  85     do {
  86         if (!strncasecmp(haystack, needle, nLen)) {
  87             return (char *)haystack;
  88         }
  89         haystack++;
  90     } while (*haystack);
  91     return NULL;
  92 }