examples/tlpi/0002-fix-setenv-compilation-error.patch

From f1154cd6558b99aa5827ac98b20a20753dabd865 Mon Sep 17 00:00:00 2001
From: chenzhijia <chenzhijia@xiaomi.com>
Date: Tue, 18 Jun 2024 18:19:18 +0800
Subject: [PATCH] tlpi/proc:fix setenv case

Remove duplicate functions and invalid commands

Change-Id: I59d84511356f6da7313844bfad63ac466fd3075f
Signed-off-by: chenzhijia <chenzhijia@xiaomi.com>
---

diff --git a/proc/setenv.c b/proc/setenv.c
index d396628..d75ae35 100644
--- a/proc/setenv.c
+++ b/proc/setenv.c
@@ -21,92 +21,25 @@
 #include <errno.h>
 
 int
-unsetenv(const char *name)
-{
-    extern char **environ;
-    char **ep, **sp;
-    size_t len;
-
-    if (name == NULL || name[0] == '\0' || strchr(name, '=') != NULL) {
-        errno = EINVAL;
-        return -1;
-    }
-
-    len = strlen(name);
-
-    for (ep = environ; *ep != NULL; )
-        if (strncmp(*ep, name, len) == 0 && (*ep)[len] == '=') {
-
-            /* Remove found entry by shifting all successive entries
-               back one element */
-
-            for (sp = ep; *sp != NULL; sp++)
-                *sp = *(sp + 1);
-
-            /* Continue around the loop to further instances of 'name' */
-
-        } else {
-            ep++;
-        }
-
-    return 0;
-}
-
-int
-setenv(const char *name, const char *value, int overwrite)
-{
-    char *es;
-
-    if (name == NULL || name[0] == '\0' || strchr(name, '=') != NULL ||
-            value == NULL) {
-        errno = EINVAL;
-        return -1;
-    }
-
-    if (getenv(name) != NULL && overwrite == 0)
-        return 0;
-
-    unsetenv(name);             /* Remove all occurrences */
-
-    es = malloc(strlen(name) + strlen(value) + 2);
-                                /* +2 for '=' and null terminator */
-    if (es == NULL)
-        return -1;
-
-    strcpy(es, name);
-    strcat(es, "=");
-    strcat(es, value);
-
-    return (putenv(es) != 0) ? -1 : 0;
-}
-
-#ifdef TEST_IT
-
-int
 main()
 {
     if (putenv("TT=xxxxx") != 0)
         perror("putenv");
 
     system("echo '***** Environment before unsetenv(TT)'; "
-            "printenv | grep ^TT");
-    system("echo 'Total lines from printenv:' `printenv | wc -l`");
+            "env");
 
     unsetenv("TT");
 
     system("echo '***** Environment after unsetenv(TT)'; "
-            "printenv | grep ^TT");
-    system("echo 'Total lines from printenv:' `printenv | wc -l`");
+            "env");
 
     setenv("xyz", "one", 1);
     setenv("xyz", "two", 0);
     setenv("xyz2", "222", 0);
 
     system("echo '***** Environment after setenv() calls'; "
-            "printenv | grep ^x");
-    system("echo 'Total lines from printenv:' `printenv | wc -l`");
+            "env");
 
     exit(EXIT_SUCCESS);
 }
-
-#endif