Add compat/unsetenv.c .

Implement a (slow) unsetenv() for older systems.

Signed-off-by: Jason Riedy <ejr@cs.berkeley.edu>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Makefile b/Makefile
index 245f658..2e95353 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -232,6 +232,7 @@ ifeq ($(uname_S),SunOS)
        SHELL_PATH = /bin/bash
        NO_STRCASESTR = YesPlease
        ifeq ($(uname_R),5.8)
+               NO_UNSETENV = YesPlease
                NO_SETENV = YesPlease
        endif
        INSTALL = ginstall
@@ -355,6 +356,10 @@ ifdef NO_SETENV
        COMPAT_CFLAGS += -DNO_SETENV
        COMPAT_OBJS += compat/setenv.o
 endif
+ifdef NO_SETENV
+       COMPAT_CFLAGS += -DNO_UNSETENV
+       COMPAT_OBJS += compat/unsetenv.o
+endif
 ifdef NO_MMAP
        COMPAT_CFLAGS += -DNO_MMAP
        COMPAT_OBJS += compat/mmap.o

diff --git a/compat/unsetenv.c b/compat/unsetenv.c
new file mode 100644 (file)
index 0000000..3a5e4ec
--- /dev/null
+++ b/compat/unsetenv.c
@@ -0,0 +1,26 @@
+#include <stdlib.h>
+#include <string.h>
+
+void gitunsetenv (const char *name)
+{
+     extern char **environ;
+     int src, dst;
+     size_t nmln;
+
+     nmln = strlen(name);
+
+     for (src = dst = 0; environ[src]; ++src) {
+         size_t enln;
+         enln = strlen(environ[src]);
+         if (enln > nmln) {
+               /* might match, and can test for '=' safely */
+              if (0 == strncmp (environ[src], name, nmln)
+                  && '=' == environ[src][nmln])
+                   /* matches, so skip */
+                   continue;
+         }
+         environ[dst] = environ[src];
+         ++dst;
+     }
+     environ[dst] = NULL;
+}

diff --git a/connect.c b/connect.c
index e1c04e1..3f2d65c 100644 (file)
--- a/connect.c
+++ b/connect.c
@@ -1,3 +1,4 @@
+#include "git-compat-util.h"
 #include "cache.h"
 #include "pkt-line.h"
 #include "quote.h"

diff --git a/git-compat-util.h b/git-compat-util.h
index 12ce659..f982b8e 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -63,6 +63,11 @@ extern int gitfakemunmap(void *start, size_t length);
 extern int gitsetenv(const char *, const char *, int);
 #endif
 
+#ifdef NO_UNSETENV
+#define unsetenv gitunsetenv
+extern void gitunsetenv(const char *);
+#endif
+
 #ifdef NO_STRCASESTR
 #define strcasestr gitstrcasestr
 extern char *gitstrcasestr(const char *haystack, const char *needle);