Re: psql \i handling ~ in specified file name

"Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
> What happens if getenv("HOME") returns NULL?

Yeah, the strdup fails. I'll take it out to fix that.

> You also need to think about Windows

Can I just ifndef WIN32 and not think about it? I'm not sure how that would
work either.

> Finally, couldn't we reduce the number
> of times strings are strdup'd only to be freed again? I don't think
> doing it this way makes the code simpler --- it took me a fair while
> to convince myself there was no memory leak.

Ok. I cut it down to one dup within the function. Attempt 2 is below.
--
Zach Irmen

Index: command.c
===================================================================
RCS file: /projects/cvsroot/pgsql-server/src/bin/psql/command.c,v
retrieving revision 1.108
diff -c -r1.108 command.c
*** command.c 1 Dec 2003 22:21:54 -0000 1.108
--- command.c 21 Dec 2003 08:10:50 -0000
***************
*** 65,70 ****
--- 65,72 ----
static bool do_connect(const char *new_dbname, const char *new_user);
static bool do_shell(const char *command);

+ static char *expand_tilde(char **filename);
+
/*----------
* HandleSlashCmds:
*
***************
*** 531,536 ****
--- 533,539 ----
}
else
{
+ expand_tilde(&fname);
success = (process_file(fname) == EXIT_SUCCESS);
free(fname);
}
***************
*** 1678,1683 ****
--- 1681,1740 ----
}

+ /* expand_tilde
+ *
+ * substitute '~' with HOME or '~username' with username's home dir
+ *
+ */
+ static char *
+ expand_tilde(char **filename)
+ {
+ if (!filename || !(*filename))
+ return NULL;
+
+ #ifndef WIN32
+
+ /* try tilde expansion */
+ if (**filename == '~')
+ {
+ char *fn;
+ char *home;
+ char oldp, *p;
+ struct passwd *pw;
+
+ fn = *filename;
+ home = NULL;
+
+ p = fn+1;
+ while (*p != '/' && *p != '\0')
+ p++;
+
+ oldp = *p;
+ *p = '\0';
+
+ if (*(fn+1) == '\0')
+ home = getenv("HOME");
+ else if ((pw = getpwnam(fn+1)) != NULL)
+ home = pw->pw_dir;
+
+ *p = oldp;
+ if (home)
+ {
+ char *newfn;
+
+ newfn = malloc(strlen(home) + strlen(p) + 1);
+ strcpy(newfn,home);
+ strcat(newfn,p);
+
+ free(fn);
+ *filename = newfn;
+ }
+ }
+
+ #endif
+
+ return *filename;
+ }

/*
* process_file