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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/ctype.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #undef CONFIG_KASAN
- #undef CONFIG_KASAN_GENERIC
- #include "../lib/string.c"
- int strncmp(const char *cs, const char *ct, size_t count)
- {
- unsigned char c1, c2;
- while (count) {
- c1 = *cs++;
- c2 = *ct++;
- if (c1 != c2)
- return c1 < c2 ? -1 : 1;
- if (!c1)
- break;
- count--;
- }
- return 0;
- }
- char *skip_spaces(const char *str)
- {
- while (isspace(*str))
- ++str;
- return (char *)str;
- }
- char *strim(char *s)
- {
- size_t size;
- char *end;
- size = strlen(s);
- if (!size)
- return s;
- end = s + size - 1;
- while (end >= s && isspace(*end))
- end--;
- *(end + 1) = '\0';
- return skip_spaces(s);
- }
- /* Works only for digits and letters, but small and fast */
- #define TOLOWER(x) ((x) | 0x20)
- static unsigned int simple_guess_base(const char *cp)
- {
- if (cp[0] == '0') {
- if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
- return 16;
- else
- return 8;
- } else {
- return 10;
- }
- }
- /**
- * simple_strtoull - convert a string to an unsigned long long
- * @cp: The start of the string
- * @endp: A pointer to the end of the parsed string will be placed here
- * @base: The number base to use
- */
- unsigned long long simple_strtoull(const char *cp, char **endp,
- unsigned int base)
- {
- unsigned long long result = 0;
- if (!base)
- base = simple_guess_base(cp);
- if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
- cp += 2;
- while (isxdigit(*cp)) {
- unsigned int value;
- value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
- if (value >= base)
- break;
- result = result * base + value;
- cp++;
- }
- if (endp)
- *endp = (char *)cp;
- return result;
- }
- long simple_strtol(const char *cp, char **endp, unsigned int base)
- {
- if (*cp == '-')
- return -simple_strtoull(cp + 1, endp, base);
- return simple_strtoull(cp, endp, base);
- }
- int kstrtobool(const char *s, bool *res)
- {
- if (!s)
- return -EINVAL;
- switch (s[0]) {
- case 'y':
- case 'Y':
- case '1':
- *res = true;
- return 0;
- case 'n':
- case 'N':
- case '0':
- *res = false;
- return 0;
- case 'o':
- case 'O':
- switch (s[1]) {
- case 'n':
- case 'N':
- *res = true;
- return 0;
- case 'f':
- case 'F':
- *res = false;
- return 0;
- default:
- break;
- }
- default:
- break;
- }
- return -EINVAL;
- }
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