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Added SDL_unsetenv()

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This commit is contained in:
Sam Lantinga
2024-07-26 22:57:53 -07:00
parent b854e1fe0b
commit 473feab2a4
9 changed files with 133 additions and 37 deletions
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99
src/stdlib/SDL_getenv.c
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@@ -30,11 +30,12 @@
#include "../core/android/SDL_android.h"
#endif
#if (defined(HAVE_GETENV) && defined(HAVE_SETENV)) || \
(defined(HAVE_GETENV) && defined(HAVE_PUTENV) && defined(HAVE_UNSETENV))
#define HAVE_LIBC_ENVIRONMENT
#elif defined(SDL_PLATFORM_WIN32) || defined(SDL_PLATFORM_WINGDK)
#if defined(SDL_PLATFORM_WIN32) || defined(SDL_PLATFORM_WINGDK)
#define HAVE_WIN32_ENVIRONMENT
#elif defined(HAVE_GETENV) && \
(defined(HAVE_SETENV) || defined(HAVE_PUTENV)) && \
(defined(HAVE_UNSETENV) || defined(HAVE_PUTENV))
#define HAVE_LIBC_ENVIRONMENT
#else
#define HAVE_LOCAL_ENVIRONMENT
#endif
@@ -64,15 +65,13 @@ int SDL_setenv(const char *name, const char *value, int overwrite)
}
if (getenv(name) != NULL) {
if (overwrite) {
unsetenv(name);
} else {
if (!overwrite) {
return 0; /* leave the existing one there. */
}
}
/* This leaks. Sorry. Get a better OS so we don't have to do this. */
SDL_aprintf(&new_variable, "%s=%s", name, value);
SDL_asprintf(&new_variable, "%s=%s", name, value);
if (!new_variable) {
return -1;
}
@@ -92,7 +91,7 @@ int SDL_setenv(const char *name, const char *value, int overwrite)
return 0; /* asked not to overwrite existing value. */
}
}
if (!SetEnvironmentVariableA(name, *value ? value : NULL)) {
if (!SetEnvironmentVariableA(name, value)) {
return -1;
}
return 0;
@@ -138,15 +137,13 @@ int SDL_setenv(const char *name, const char *value, int overwrite)
len = (value - name);
for (; SDL_env[i]; ++i) {
if (SDL_strncmp(SDL_env[i], name, len) == 0) {
/* If we found it, just replace the entry */
SDL_free(SDL_env[i]);
SDL_env[i] = new_variable;
added = 1;
break;
}
}
/* If we found it, just replace the entry */
if (SDL_env[i]) {
SDL_free(SDL_env[i]);
SDL_env[i] = new_variable;
added = 1;
}
}
/* Didn't find it in the environment, expand and add */
@@ -165,6 +162,68 @@ int SDL_setenv(const char *name, const char *value, int overwrite)
}
#endif // HAVE_LIBC_ENVIRONMENT
#ifdef HAVE_LIBC_ENVIRONMENT
#if defined(HAVE_UNSETENV)
int SDL_unsetenv(const char *name)
{
/* Input validation */
if (!name || *name == '\0' || SDL_strchr(name, '=') != NULL) {
return -1;
}
return unsetenv(name);
}
/* We have a real environment table, but no unsetenv? Fake it w/ putenv. */
#else
int SDL_unsetenv(const char *name)
{
/* Input validation */
if (!name || *name == '\0' || SDL_strchr(name, '=') != NULL) {
return -1;
}
// Hope this environment uses the non-standard extension of removing the environment variable if it has no '='
return putenv(name);
}
#endif
#elif defined(HAVE_WIN32_ENVIRONMENT)
int SDL_unsetenv(const char *name)
{
/* Input validation */
if (!name || *name == '\0' || SDL_strchr(name, '=') != NULL) {
return -1;
}
if (!SetEnvironmentVariableA(name, NULL)) {
return -1;
}
return 0;
}
#else
int SDL_unsetenv(const char *name)
{
size_t len, i;
/* Input validation */
if (!name || *name == '\0' || SDL_strchr(name, '=') != NULL) {
return -1;
}
if (SDL_env) {
len = SDL_strlen(name);
for (i = 0; SDL_env[i]; ++i) {
if ((SDL_strncmp(SDL_env[i], name, len) == 0) &&
(SDL_env[i][len] == '=')) {
/* Just clear out this entry for now */
*SDL_env[i] = '\0';
break;
}
}
}
return 0;
}
#endif // HAVE_LIBC_ENVIRONMENT
/* Retrieve a variable named "name" from the environment */
#ifdef HAVE_LIBC_ENVIRONMENT
const char *SDL_getenv(const char *name)
@@ -194,6 +253,7 @@ const char *SDL_getenv(const char *name)
}
for ( ; ; ) {
SetLastError(ERROR_SUCCESS);
length = GetEnvironmentVariableA(name, string, maxlen);
if (length > maxlen) {
@@ -204,6 +264,12 @@ const char *SDL_getenv(const char *name)
string = temp;
maxlen = length;
} else {
if (GetLastError() != ERROR_SUCCESS) {
if (string) {
SDL_free(string);
}
return NULL;
}
break;
}
}
@@ -227,10 +293,11 @@ const char *SDL_getenv(const char *name)
value = (char *)0;
if (SDL_env) {
len = SDL_strlen(name);
for (i = 0; SDL_env[i] && !value; ++i) {
for (i = 0; SDL_env[i]; ++i) {
if ((SDL_strncmp(SDL_env[i], name, len) == 0) &&
(SDL_env[i][len] == '=')) {
value = &SDL_env[i][len + 1];
break;
}
}
}