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73 lines
2.0 KiB
73 lines
2.0 KiB
5 years ago
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#include <string.h>
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#include <stddef.h>
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size_t strlcat(char *__restrict__ dst, const char *__restrict__ src, size_t capacity)
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{
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if (!dst) { return 0; }
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if (!src) { return 0; }
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size_t used = strnlen(dst, capacity);
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if (used >= capacity) { used = capacity - 1; }
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size_t to_print = strlen(src);
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// to_print does not include the terminator
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const size_t needed = used + to_print + 1;
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if (needed > capacity) {
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to_print = capacity - used - 1;
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}
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memcpy(dst + used, src, to_print);
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*(dst + used + to_print) = '\0';
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return needed;
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}
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size_t strlncat(char *__restrict__ dst, const char *__restrict__ src, size_t capacity, size_t num)
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{
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if (!dst) { return 0; }
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if (!src) { return 0; }
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size_t used = strnlen(dst, capacity);
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if (used >= capacity) { used = capacity - 1; }
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size_t to_print = strlen(src);
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if (to_print > num) {
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to_print = num;
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}
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// to_print does not include the terminator
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const size_t needed = used + to_print + 1;
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if (needed > capacity) {
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to_print = capacity - used - 1;
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}
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memcpy(dst + used, src, to_print);
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*(dst + used + to_print) = '\0';
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return needed;
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}
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size_t strlcpy(char *__restrict__ dst, const char *__restrict__ src, size_t capacity)
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{
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if (!dst) { return 0; }
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if (!src) { return 0; }
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size_t to_print = strlen(src);
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// to_print does not include the terminator
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const size_t needed = to_print + 1;
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if (needed > capacity) {
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to_print = capacity - 1;
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}
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memcpy(dst, src, to_print);
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*(dst + to_print) = '\0';
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return needed;
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}
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size_t strlncpy(char *__restrict__ dst, const char *__restrict__ src, size_t capacity, size_t num)
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{
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if (!dst) { return 0; }
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if (!src) { return 0; }
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size_t to_print = strlen(src);
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if (to_print > num) {
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to_print = num;
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}
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// to_print does not include the terminator
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const size_t needed = to_print + 1;
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if (needed > capacity) {
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to_print = capacity - 1;
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}
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memcpy(dst, src, to_print);
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*(dst + to_print) = '\0';
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return needed;
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}
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