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Cream of the Crop 1
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SRC1229B.ARJ
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PATHNAME.C
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C/C++ Source or Header
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1991-03-08
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3KB
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123 lines
/* Convert relative to absolute pathnames
* Copyright 1991 Phil Karn, KA9Q
*/
#include <stdio.h>
#include "global.h"
#include "dirutil.h"
static void crunch __ARGS((char *buf,char *path));
/* Given a working directory and an arbitrary pathname, resolve them into
* an absolute pathname. Memory is allocated for the result, which
* the caller must free
*/
char *
pathname(cd,path)
char *cd; /* Current working directory */
char *path; /* Pathname argument */
{
register char *buf;
#ifdef MSDOS
char *cp,c;
char *tbuf;
int tflag = 0;
#endif
if(cd == NULLCHAR || path == NULLCHAR)
return NULLCHAR;
#ifdef MSDOS
/* If path has any backslashes, make a local copy with them
* translated into forward slashes
*/
if(strchr(path,'\\') != NULLCHAR){
tflag = 1;
cp = tbuf = mallocw(strlen(path));
while((c = *path++) != '\0'){
if(c == '\\')
*cp++ = '/';
else
*cp++ = c;
}
*cp = '\0';
path = tbuf;
}
#endif
/* Strip any leading white space on args */
while(*cd == ' ' || *cd == '\t')
cd++;
while(*path == ' ' || *path == '\t')
path++;
/* Allocate and initialize output buffer; user must free */
buf = mallocw((unsigned)strlen(cd) + strlen(path) + 10); /* fudge factor */
buf[0] = '\0';
/* Interpret path relative to cd only if it doesn't begin with "/" */
if(path[0] != '/')
crunch(buf,cd);
crunch(buf,path);
/* Special case: null final path means the root directory */
if(buf[0] == '\0'){
buf[0] = '/';
buf[1] = '\0';
}
#ifdef MSDOS
if(tflag)
free(tbuf);
#endif
return buf;
}
/* Process a path name string, starting with and adding to
* the existing buffer
*/
static void
crunch(buf,path)
char *buf;
register char *path;
{
register char *cp;
cp = buf + strlen(buf); /* Start write at end of current buffer */
/* Now start crunching the pathname argument */
for(;;){
/* Strip leading /'s; one will be written later */
while(*path == '/')
path++;
if(*path == '\0')
break; /* no more, all done */
/* Look for parent directory references, either at the end
* of the path or imbedded in it
*/
if(strcmp(path,"..") == 0 || strncmp(path,"../",3) == 0){
/* Hop up a level */
if((cp = strrchr(buf,'/')) == NULLCHAR)
cp = buf; /* Don't back up beyond root */
*cp = '\0'; /* In case there's another .. */
path += 2; /* Skip ".." */
while(*path == '/') /* Skip one or more slashes */
path++;
/* Look for current directory references, either at the end
* of the path or imbedded in it
*/
} else if(strcmp(path,".") == 0 || strncmp(path,"./",2) == 0){
/* "no op" */
path++; /* Skip "." */
while(*path == '/') /* Skip one or more slashes */
path++;
} else {
/* Ordinary name, copy up to next '/' or end of path */
*cp++ = '/';
while(*path != '/' && *path != '\0')
*cp++ = *path++;
}
}
*cp++ = '\0';
}