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#include <string.h>
#include <pwd.h>
extern char homedir[];
void expand_tilde (char *buf, char *str);
void
expand_tilde (char *buf, char *str)
{
register char *p = str;
register int len;
if (*p == '~') {
p++;
if (*p == '/' || !*p) {
len = strlen(homedir);
strcpy(&(buf[len]), p);
memcpy(buf, homedir, len);
} else {
char *rest;
struct passwd *pwe;
if ((rest = strchr(p, '/')))
*rest++ = 0;
if ((pwe = getpwnam(p))) {
len = strlen(pwe->pw_dir);
if (rest) {
strcpy(&(buf[len + 1]), rest);
buf[len] = '/';
}
memcpy(buf, pwe->pw_dir, len);
}
}
} else
strcpy(buf, str);
}
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