aria/string.c at main · fuga-org/aria · GitHub

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#include <aria/stream.h>
#include <aria/string.h>
#include <aria/compiler.h>

static void sprint_write(struct stream_info *, char);

struct sprint_info {
	char *stream;
	int index;
};

struct stream_info sprint_stream_info = { .write = sprint_write };

int strcmp(const char *str0, const char *str1)
{
	for (size_t i = 0;; i++) {
		if (str0[i] != str1[i]) {
			return str0[i] - str1[i];
		}

		if (!str0[i]) {
			return 0;
		}
	}
}

int strncmp(const char *str0, const char *str1, size_t n)
{
	for (size_t i = 0; i < n; i++) {
		if (str0[i] != str1[i]) {
			return str0[i] - str1[i];
		}

		if (!str0[i]) {
			return 0;
		}
	}

	return 0;
}

char *strcpy(char *dest, const char *src)
{
	if (!src || !dest) {
		return dest;
	}

	size_t i = 0;

	for (; src[i]; i++) {
		dest[i] = src[i];
	}

	dest[i] = 0;

	return dest;
}

char *strncpy(char *dest, const char *src, size_t n)
{
	size_t i = 0;

	for (; i < n && src[i]; i++) {
		dest[i] = src[i];
	}

	dest[i] = 0;

	return dest;
}

char *strchr(const char *str, char c)
{
	while (*str++) {
		if (*str == c) {
			return (char *)str;
		}
	}
	return NULL;
}

int memcmp(const char *str0, const char *str1, size_t n)
{
	for (size_t i = 0; i < n; i++) {
		if (str0[i] != str1[i]) {
			return str0[i] - str1[i];
		}
	}

	return 0;
}

void memcpy(void *dest, const void *src, size_t n)
{
	memcpy8(dest, src, n);
}

void memset(void *src, int data, size_t n)
{
	memset8(src, data, n);
}

void sprint(char *str, ...)
{
	va_list arg;
	va_start(arg, str);

	struct sprint_info sprint_info = { .stream = str, .index = 0 };

	spinlock(&sprint_stream_info.lock);

	sprint_stream_info.private = &sprint_info;
	stream_print(&sprint_stream_info, va_arg(arg, char *), arg);
	sprint_write(&sprint_stream_info, '\0');

	spinrelease(&sprint_stream_info.lock);

	va_end(arg);
}

static void sprint_write(struct stream_info *stream, char c)
{
	if (unlikely(stream == NULL))
		return;

	struct sprint_info *info = stream->private;
	if (unlikely(info == NULL))
		return;

	info->stream[info->index++] = c;
}