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compat/basename.c: provide a dirname() compatibility function

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When there is no `libgen.h` to our disposal, we miss the `dirname()`
function.  Earlier we added basename() compatibility function for
the same reason at e1c06886 (compat: add a basename() compatibility
function, 2009-05-31).

So far, we only had one user of that function: credential-cache--daemon
(which was only compiled when Unix sockets are available, anyway). But
now we also have `builtin/am.c` as user, so we need it.

Since `dirname()` is a sibling of `basename()`, we simply put our very
own `gitdirname()` implementation next to `gitbasename()` and use it
if `NO_LIBGEN_H` has been set.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2016-01-12 08:57:36 +01:00 committed by Junio C Hamano
parent 61725be349
commit 824682ab51
2 changed files with 46 additions and 0 deletions
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44
compat/basename.c
View File

@ -1,4 +1,5 @@
#include "../git-compat-util.h"
#include "../strbuf.h"
/* Adapted from libiberty's basename.c. */
char *gitbasename (char *path)
@ -25,3 +26,46 @@ char *gitbasename (char *path)
}
return (char *)base;
}
char *gitdirname(char *path)
{
static struct strbuf buf = STRBUF_INIT;
char *p = path, *slash = NULL, c;
int dos_drive_prefix;
if (!p)
return ".";
if ((dos_drive_prefix = skip_dos_drive_prefix(&p)) && !*p)
goto dot;
/*
* POSIX.1-2001 says dirname("/") should return "/", and dirname("//")
* should return "//", but dirname("///") should return "/" again.
*/
if (is_dir_sep(*p)) {
if (!p[1] || (is_dir_sep(p[1]) && !p[2]))
return path;
slash = ++p;
}
while ((c = *(p++)))
if (is_dir_sep(c)) {
char *tentative = p - 1;
/* POSIX.1-2001 says to ignore trailing slashes */
while (is_dir_sep(*p))
p++;
if (*p)
slash = tentative;
}
if (slash) {
*slash = '\0';
return path;
}
dot:
strbuf_reset(&buf);
strbuf_addf(&buf, "%.*s.", dos_drive_prefix, path);
return buf.buf;
}

2
git-compat-util.h
View File

@ -253,6 +253,8 @@ struct itimerval {
#else
#define basename gitbasename
extern char *gitbasename(char *);
#define dirname gitdirname
extern char *gitdirname(char *);
#endif
#ifndef NO_ICONV