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/**************************************************************/
/* tpax: a topological pax implementation */
/* Copyright (C) 2020--2024 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/**************************************************************/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <tpax/tpax.h>
#include "tpax_driver_impl.h"
int tpax_path_copy(
char * dstpath,
const char * srcpath,
size_t bufsize,
uint32_t flags,
size_t * nwritten)
{
const char * src;
char * dst;
char * cap;
if (!bufsize) {
errno = ENOBUFS;
return -1;
}
src = srcpath;
dst = dstpath;
cap = &dst[bufsize];
if ((src[0] == '/') && (src[1] == '/') && (src[2] != '/')) {
*dst++ = *src++;
*dst++ = *src++;
}
if (flags & TPAX_DRIVER_PURE_PATH_OUTPUT)
if ((src[0] == '.') && (src[1] == '/'))
for (++src; *src=='/'; src++)
(void)0;
for (; *src; ) {
if ((src[0] == '.') && (src[1] == '.')) {
if ((src[2] == '/') || (src[2] == '\0')) {
if (flags & TPAX_DRIVER_STRICT_PATH_INPUT) {
errno = EINVAL;
return -1;
}
}
}
if (flags & TPAX_DRIVER_PURE_PATH_OUTPUT) {
if ((src[0] == '.') && (src[1] == '/') && (src[-1] == '/')) {
for (++src; *src=='/'; src++)
(void)0;
} else if ((src[0] == '/')) {
for (src++; *src=='/'; src++)
(void)0;
*dst++ = '/';
} else {
*dst++ = *src++;
}
} else {
*dst++ = *src++;
}
if (dst == cap) {
errno = ENOBUFS;
return -1;
}
}
if (nwritten)
*nwritten = dst - dstpath;
*dst = '\0';
return 0;
}
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