ubgpsuite/lonetix/sys/fs_common.c

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2021-06-07 16:55:13 +02:00
// SPDX-License-Identifier: LGPL-3.0-or-later
#include "sys/fs.h"
#include "strlib.h"
#include <assert.h>
#include <string.h>
static Boolean IsSep(char c)
{
return c == '/' || c == '\\' || c == ':';
}
char *Sys_GetAbsoluteFileExtension(const char *path)
{
char *p = (char *) path;
char *sep = p, *extp = p;
// FIXME make it more reliable
while (*p != '\0') {
if (*p == '.' && extp == sep)
extp = p;
if (IsSep(*p))
extp = sep = p;
p++;
}
if (extp == sep)
extp = p; // no extensions in path
return extp;
}
char *Sys_GetFileExtension(const char *path)
{
char *p = (char *) path;
char *sep = p, *extp = p;
// FIXME make it more reliable
while (*p != '\0') {
if (*p == '.')
extp = p;
if (IsSep(*p))
sep = extp = p;
p++;
}
if (extp == sep)
extp = p; // no extensions in path
return extp;
}
char *Sys_SetFileExtension(char *path, const char *ext)
{
assert(*ext == '.' && *(ext+1) != '\0');
char *extp = Sys_GetFileExtension(path);
return strcpy(extp, ext);
}
size_t Sys_StripFileExtension(char *path, const char *ext)
{
if (!ext)
ext = "";
assert(*ext == '\0' || (*ext == '.' && *(ext+1) != '\0'));
char *extp = Sys_GetFileExtension(path);
if (*ext == '\0' || Df_stricmp(ext, extp) == 0)
*extp = '\0';
return extp - path;
}
char *Sys_DefaultFileExtension(char *path, const char *ext)
{
assert(*ext == '.' && *(ext+1) != '\0');
char *extp = Sys_GetFileExtension(path);
if (*extp == '\0')
strcpy(extp, ext);
return extp;
}
static size_t Sys_StripPathFast(char *path)
{
size_t len = strlen(path);
size_t i = len;
while (i-- > 0) {
if (IsSep(path[i])) {
size_t start = i + 1;
size_t n = len - start;
memmove(path, path + start, n + 1);
return n;
}
}
return len;
}
size_t Sys_StripPath(char *path, const char *basePath)
{
if (!basePath || *basePath == '\0')
return Sys_StripPathFast(path); // fast case, no basePath
int c1, c2;
size_t i = 0, j = 0;
while (TRUE) {
c1 = path[i];
c2 = basePath[j];
if (c1 == '\\' || c1 == ':' || c1 == '\0')
c1 = '/';
if (c2 == '\\' || c2 == ':' || c2 == '\0')
c2 = '/';
if (c1 != c2)
return i + strlen(path + i);
while (IsSep(path[i])) i++;
while (IsSep(basePath[j])) j++;
if (basePath[j] == '\0')
break;
i++;
j++;
}
size_t n = strlen(path + i);
memmove(path, path + i, n + 1);
return n;
}
size_t Sys_PathDepth(const char *path)
{
size_t n = 0;
const char *p = path;
while (IsSep(*p))
p++;
while (TRUE) {
// Skip anything that isn't a separator
while (*p != '\0' && !IsSep(*p))
p++;
if (*p == '\0')
break;
n++;
// Skip any consecutive separator
while (IsSep(*p))
p++;
}
return n;
}
size_t Sys_ConvertPath(char *path)
{
// Strip leading slashes
char *start = path;
while (*start != '\0') {
if (IsSep(*start))
break;
start++;
}
// Convert path separators to '/'
char *end = start;
while (*end != '\0') {
if (*end == '\\' || *end == ':')
*end = '/';
end++;
}
// Move everything to the beginning of the string
size_t n = end - start;
memmove(path, start, n + 1);
return n;
}
size_t Sys_ReplaceSeps(char *path)
{
Boolean lastWasSep = FALSE;
char *p = path;
while (*p != '\0') {
if (IsSep(*p)) {
if (!lastWasSep) {
*p = PATH_SEP;
lastWasSep = TRUE;
} else {
memmove(p, p + 1, strlen(p)); // NOTE: no +1
}
} else {
lastWasSep = FALSE;
}
p++;
}
return p - path;
}
int Sys_PathCompare(const char *p1, const char *p2)
{
int c1, c2;
do {
c1 = *p1++;
c2 = *p2++;
if (IsSep(c1)) {
c1 = '/';
while (IsSep(*p1)) p1++;
}
if (IsSep(c2)) {
c2 = '/';
while (IsSep(*p2)) p2++;
}
} while (c1 == c2 && c1 != '\0');
return c1 - c2;
}