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LibCore+LibC: Add wrapper for setenv

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I also added a common interface with StringView compatible parameters:

int serenity_setenv(const char*, ssize_t, const char*, ssize_t, int)

This function is called by both C and C++ API for setenv().
This commit is contained in:
Lucas CHOLLET 2022-03-01 23:43:55 +01:00 committed by Andreas Kling
parent b1af1b399e
commit ddf9987c39
Notes: sideshowbarker 2024-07-17 18:03:20 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/ddf9987c39
Pull-request: https://github.com/SerenityOS/serenity/pull/12845
4 changed files with 26 additions and 3 deletions
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11
Userland/Libraries/LibC/stdlib.cpp
View File

@ -305,12 +305,17 @@ int clearenv()
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/setenv.html
int setenv(const char* name, const char* value, int overwrite)
{
return serenity_setenv(name, strlen(name), value, strlen(value), overwrite);
}
int serenity_setenv(const char* name, ssize_t name_length, const char* value, ssize_t value_length, int overwrite)
{
if (!overwrite && getenv(name))
return 0;
auto length = strlen(name) + strlen(value) + 2;
auto* var = (char*)malloc(length);
snprintf(var, length, "%s=%s", name, value);
auto const total_length = name_length + value_length + 2;
auto* var = (char*)malloc(total_length);
snprintf(var, total_length, "%s=%s", name, value);
s_malloced_environment_variables.set((FlatPtr)var);
return putenv(var);
}

1
Userland/Libraries/LibC/stdlib.h
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@ -33,6 +33,7 @@ int putenv(char*);
int unsetenv(const char*);
int clearenv(void);
int setenv(const char* name, const char* value, int overwrite);
int serenity_setenv(const char* name, ssize_t name_length, const char* value, ssize_t value_length, int overwrite);
const char* getprogname(void);
void setprogname(const char*);
int atoi(const char*);

15
Userland/Libraries/LibCore/System.cpp
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@ -14,6 +14,7 @@
#include <LibSystem/syscall.h>
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/ptrace.h>
@ -1069,4 +1070,18 @@ ErrorOr<void> mkfifo(StringView pathname, mode_t mode)
return mknod(pathname, mode | S_IFIFO, 0);
}
ErrorOr<void> setenv(StringView name, StringView value, bool overwrite)
{
#ifdef __serenity__
auto const rc = ::serenity_setenv(name.characters_without_null_termination(), name.length(), value.characters_without_null_termination(), value.length(), overwrite);
#else
String name_string = name;
String value_string = value;
auto const rc = ::setenv(name_string.characters(), value_string.characters(), overwrite);
#endif
if (rc < 0)
return Error::from_syscall("setenv", -errno);
return {};
}
}

2
Userland/Libraries/LibCore/System.h
View File

@ -145,4 +145,6 @@ ErrorOr<void> socketpair(int domain, int type, int protocol, int sv[2]);
ErrorOr<Vector<gid_t>> getgroups();
ErrorOr<void> mknod(StringView pathname, mode_t mode, dev_t dev);
ErrorOr<void> mkfifo(StringView pathname, mode_t mode);
ErrorOr<void> setenv(StringView, StringView, bool);
}