linux/arch/s390/boot/string.c
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   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/ctype.h>
   3#include <linux/kernel.h>
   4#include <linux/errno.h>
   5#undef CONFIG_KASAN
   6#undef CONFIG_KASAN_GENERIC
   7#include "../lib/string.c"
   8
   9int strncmp(const char *cs, const char *ct, size_t count)
  10{
  11        unsigned char c1, c2;
  12
  13        while (count) {
  14                c1 = *cs++;
  15                c2 = *ct++;
  16                if (c1 != c2)
  17                        return c1 < c2 ? -1 : 1;
  18                if (!c1)
  19                        break;
  20                count--;
  21        }
  22        return 0;
  23}
  24
  25char *skip_spaces(const char *str)
  26{
  27        while (isspace(*str))
  28                ++str;
  29        return (char *)str;
  30}
  31
  32char *strim(char *s)
  33{
  34        size_t size;
  35        char *end;
  36
  37        size = strlen(s);
  38        if (!size)
  39                return s;
  40
  41        end = s + size - 1;
  42        while (end >= s && isspace(*end))
  43                end--;
  44        *(end + 1) = '\0';
  45
  46        return skip_spaces(s);
  47}
  48
  49/* Works only for digits and letters, but small and fast */
  50#define TOLOWER(x) ((x) | 0x20)
  51
  52static unsigned int simple_guess_base(const char *cp)
  53{
  54        if (cp[0] == '0') {
  55                if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
  56                        return 16;
  57                else
  58                        return 8;
  59        } else {
  60                return 10;
  61        }
  62}
  63
  64/**
  65 * simple_strtoull - convert a string to an unsigned long long
  66 * @cp: The start of the string
  67 * @endp: A pointer to the end of the parsed string will be placed here
  68 * @base: The number base to use
  69 */
  70
  71unsigned long long simple_strtoull(const char *cp, char **endp,
  72                                   unsigned int base)
  73{
  74        unsigned long long result = 0;
  75
  76        if (!base)
  77                base = simple_guess_base(cp);
  78
  79        if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
  80                cp += 2;
  81
  82        while (isxdigit(*cp)) {
  83                unsigned int value;
  84
  85                value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
  86                if (value >= base)
  87                        break;
  88                result = result * base + value;
  89                cp++;
  90        }
  91        if (endp)
  92                *endp = (char *)cp;
  93
  94        return result;
  95}
  96
  97long simple_strtol(const char *cp, char **endp, unsigned int base)
  98{
  99        if (*cp == '-')
 100                return -simple_strtoull(cp + 1, endp, base);
 101
 102        return simple_strtoull(cp, endp, base);
 103}
 104
 105int kstrtobool(const char *s, bool *res)
 106{
 107        if (!s)
 108                return -EINVAL;
 109
 110        switch (s[0]) {
 111        case 'y':
 112        case 'Y':
 113        case '1':
 114                *res = true;
 115                return 0;
 116        case 'n':
 117        case 'N':
 118        case '0':
 119                *res = false;
 120                return 0;
 121        case 'o':
 122        case 'O':
 123                switch (s[1]) {
 124                case 'n':
 125                case 'N':
 126                        *res = true;
 127                        return 0;
 128                case 'f':
 129                case 'F':
 130                        *res = false;
 131                        return 0;
 132                default:
 133                        break;
 134                }
 135        default:
 136                break;
 137        }
 138
 139        return -EINVAL;
 140}
 141
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