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140 lines
2.2 KiB
140 lines
2.2 KiB
// 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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