stdio - Path normalization
Posted: Mon Sep 25, 2006 6:00 am
Hi,
I wanted to add a normalization function in stdio.c
the function is greatly inspired by the one present in the pspsdk, so credits is for the orginal authors.
I wanted to call it from the fopen function :
any comments ?
I wanted to add a normalization function in stdio.c
Code: Select all
/* Normalize a pathname by removing
. and .. components, duplicated /, etc. */
char* __ps2_normalize_path(char *path_name)
{
int i, j;
int first, next;
static char out[255];
/* First copy the path into our temp buffer */
strcpy(out, path_name);
/* Then append "/" to make the rest easier */
strcat(out,"/");
/* Convert "//" to "/" */
for(i=0; out[i+1]; i++) {
if(out[i]=='/' && out[i+1]=='/') {
for(j=i+1; out[j]; j++)
out[j] = out[j+1];
i--;
}
}
/* Convert "/./" to "/" */
for(i=0; out[i] && out[i+1] && out[i+2]; i++) {
if(out[i]=='/' && out[i+1]=='.' && out[i+2]=='/') {
for(j=i+1; out[j]; j++)
out[j] = out[j+2];
i--;
}
}
/* Convert "/path/../" to "/" until we can't anymore. Also
* convert leading "/../" to "/" */
first = next = 0;
while(1) {
/* If a "../" follows, remove it and the parent */
if(out[next+1] && out[next+1]=='.' &&
out[next+2] && out[next+2]=='.' &&
out[next+3] && out[next+3]=='/') {
for(j=0; out[first+j+1]; j++)
out[first+j+1] = out[next+j+4];
first = next = 0;
continue;
}
/* Find next slash */
first = next;
for(next=first+1; out[next] && out[next] != '/'; next++)
continue;
if(!out[next]) break;
}
/* Remove trailing "/" */
for(i=1; out[i]; i++)
continue;
if(i >= 1 && out[i-1] == '/')
out[i-1] = 0;
return (char*)out;
}
I wanted to call it from the fopen function :
Code: Select all
if (i < _NFILE) {
char * t_fname = __ps2_normalize_path((char *)fname);
char b_fname[FILENAME_MAX];
__iob[i].type = __stdio_get_fd_type(fname);