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/*
** chgext.c - Change a file's extension
**
** public domain by Bob Stout
**
** Arguments: 1 - Pathname
** 2 - Old extension (NULL if don't care)
** 3 - New extension
**
** Returns: Pathname or NULL if failed
**
** Note: Pathname buffer must be long enough to append new extension
**
** Side effect: Converts Unix style pathnames to DOS style
*/
#include <stdio.h>
#include <string.h>
char *chgext(char *path, char *oldext, char *newext)
{
char *p;
/* Convert to DOS-style path name */
for (p = path; *p; ++p)
if ('/' == *p)
*p = '\\';
/* Find extension or point to end for appending */
if (NULL == (p = strrchr(path, '.')) || NULL != strchr(p, '\\'))
p = strcpy(&path[strlen(path)], ".");
++p;
/* Check for old extension */
if (oldext && strcmp(p, oldext))
return NULL;
/* Add new extension */
while ('.' == *newext)
++newext;
strncpy(p, newext, 3);
return path;
}
#ifdef TEST
void main(int argc, char *argv[])
{
char *retval, *old_ext = NULL, path[128];
if (2 > argc)
{
puts("Usage: CHGEXT path [old_ext]");
puts("\nChanges extension to \".TST\"");
puts("Old extension optional");
return;
}
strcpy(path, strupr(argv[1]));
if (2 < argc)
old_ext = strupr(argv[2]);
if (NULL == (retval = chgext(path, old_ext, ".TSTstuff")))
puts("chgext() failed");
else printf("chgext(%s, %s, TST)\n...returned...\n%s\n", argv[1],
old_ext ? old_ext : "NULL", path);
}
#endif /* TEST */
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