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