70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
#include <stddef.h>
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#include <stdint.h>
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#include <lib/libc.h>
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int toupper(int c) {
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if (c >= 'a' && c <= 'z') {
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return c - 0x20;
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}
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return c;
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}
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int tolower(int c) {
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if (c >= 'A' && c <= 'Z') {
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return c + 0x20;
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}
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return c;
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}
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char *strcpy(char *dest, const char *src) {
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size_t i;
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for (i = 0; src[i]; i++)
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dest[i] = src[i];
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dest[i] = 0;
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return dest;
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}
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char *strncpy(char *dest, const char *src, size_t n) {
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size_t i;
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for (i = 0; i < n && src[i]; i++)
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dest[i] = src[i];
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for ( ; i < n; i++)
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dest[i] = 0;
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return dest;
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}
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int strcmp(const char *s1, const char *s2) {
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for (size_t i = 0; ; i++) {
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char c1 = s1[i], c2 = s2[i];
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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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return 0;
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}
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}
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int strncmp(const char *s1, const char *s2, size_t n) {
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for (size_t i = 0; i < n; i++) {
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char c1 = s1[i], c2 = s2[i];
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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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return 0;
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}
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return 0;
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}
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size_t strlen(const char *str) {
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size_t len;
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for (len = 0; str[len]; len++);
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return len;
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}
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