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LibC: Implement asprintf() and vasprintf()

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These simply use StringBuilder::appendvf() internally which is not
optimal in terms of heap allocations, but simple enough and I don't
think they are performance sensitive functions anyway.
This commit is contained in:
Andreas Kling 2021-03-28 18:39:32 +02:00
parent 5f71bf0cc7
commit fdd01a0a07
Notes: sideshowbarker 2024-07-18 20:59:58 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/fdd01a0a07d
2 changed files with 27 additions and 1 deletions
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24
Userland/Libraries/LibC/stdio.cpp
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@ -29,6 +29,7 @@
#include <AK/PrintfImplementation.h>
#include <AK/ScopedValueRollback.h>
#include <AK/StdLibExtras.h>
#include <AK/String.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
@ -880,6 +881,29 @@ int printf(const char* fmt, ...)
return ret;
}
int vasprintf(char** strp, const char* fmt, va_list ap)
{
StringBuilder builder;
builder.appendvf(fmt, ap);
VERIFY(builder.length() <= NumericLimits<int>::max());
int length = builder.length();
*strp = strdup(builder.to_string().characters());
return length;
}
int asprintf(char** strp, const char* fmt, ...)
{
StringBuilder builder;
va_list ap;
va_start(ap, fmt);
builder.appendvf(fmt, ap);
va_end(ap);
VERIFY(builder.length() <= NumericLimits<int>::max());
int length = builder.length();
*strp = strdup(builder.to_string().characters());
return length;
}
static void buffer_putch(char*& bufptr, char ch)
{
*bufptr++ = ch;

4
Userland/Libraries/LibC/stdio.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -89,6 +89,7 @@ size_t fread(void* ptr, size_t size, size_t nmemb, FILE*);
size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE*);
int vprintf(const char* fmt, va_list) __attribute__((format(printf, 1, 0)));
int vfprintf(FILE*, const char* fmt, va_list) __attribute__((format(printf, 2, 0)));
int vasprintf(char** strp, const char* fmt, va_list) __attribute__((format(printf, 2, 0)));
int vsprintf(char* buffer, const char* fmt, va_list) __attribute__((format(printf, 2, 0)));
int vsnprintf(char* buffer, size_t, const char* fmt, va_list) __attribute__((format(printf, 3, 0)));
int fprintf(FILE*, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
@ -96,6 +97,7 @@ int printf(const char* fmt, ...) __attribute__((format(printf, 1, 2)));
void dbgputch(char);
void dbgputstr(const char*, size_t);
int sprintf(char* buffer, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
int asprintf(char** strp, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
int snprintf(char* buffer, size_t, const char* fmt, ...) __attribute__((format(printf, 3, 4)));
int putchar(int ch);
int putc(int ch, FILE*);