[thirdparty/git.git] / compat / mmap.c

#include "../git-compat-util.h"

void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
{
	size_t n = 0;

	if (start != NULL || flags != MAP_PRIVATE || prot != PROT_READ)
		die("Invalid usage of mmap when built with NO_MMAP");

	start = xmalloc(length);
	if (start == NULL) {
		errno = ENOMEM;
		return MAP_FAILED;
	}

	while (n < length) {
		ssize_t count = xpread(fd, (char *)start + n, length - n, offset + n);

		if (count == 0) {
			memset((char *)start+n, 0, length-n);
			break;
		}

		if (count < 0) {
			free(start);
			errno = EACCES;
			return MAP_FAILED;
		}

		n += count;
	}

	return start;
}

int git_munmap(void *start, size_t length)
{
	free(start);
	return 0;
}
Commit	Line	Data
	1	#include "../git-compat-util.h"
	2
	3	void git_mmap(void start, size_t length, int prot, int flags, int fd, off_t offset)
	4	{
	5	size_t n = 0;
	6
	7	if (start != NULL \|\| flags != MAP_PRIVATE \|\| prot != PROT_READ)
	8	die("Invalid usage of mmap when built with NO_MMAP");
	9
	10	start = xmalloc(length);
	11	if (start == NULL) {
	12	errno = ENOMEM;
	13	return MAP_FAILED;
	14	}
	15
	16	while (n < length) {
	17	ssize_t count = xpread(fd, (char *)start + n, length - n, offset + n);
	18
	19	if (count == 0) {
	20	memset((char *)start+n, 0, length-n);
	21	break;
	22	}
	23
	24	if (count < 0) {
	25	free(start);
	26	errno = EACCES;
	27	return MAP_FAILED;
	28	}
	29
	30	n += count;
	31	}
	32
	33	return start;
	34	}
	35
	36	int git_munmap(void *start, size_t length)
	37	{
	38	free(start);
	39	return 0;
	40	}