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LibC: Implement vdprintf and dprintf

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These functions work just like `vfprintf` and `fprintf`, except that
they take a file descriptor as their first argument instead of a FILE*.
This commit is contained in:
René Hickersberger 2023-06-24 11:50:54 +02:00 • committed by Tim Schumacher
parent daf3d4c6ef
commit ad560cff0f
2 changed files with 19 additions and 0 deletions
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17
Userland/Libraries/LibC/stdio.cpp
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@ -907,6 +907,23 @@ int fprintf(FILE* stream, char const* fmt, ...)
return ret;
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/vdprintf.html
int vdprintf(int fd, char const* fmt, va_list ap)
{
// FIXME: Implement buffering so that we don't issue one write syscall for every character.
return printf_internal([fd](auto, char ch) { write(fd, &ch, 1); }, nullptr, fmt, ap);
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/dprintf.html
int dprintf(int fd, char const* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
int ret = vdprintf(fd, fmt, ap);
va_end(ap);
return ret;
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/vprintf.html
int vprintf(char const* fmt, va_list ap)
{

2
Userland/Libraries/LibC/stdio.h
View file

@ -79,6 +79,8 @@ int vfprintf(FILE*, char const* fmt, va_list) __attribute__((format(printf, 2, 0
int vasprintf(char** strp, char const* fmt, va_list) __attribute__((format(printf, 2, 0)));
int vsprintf(char* buffer, char const* fmt, va_list) __attribute__((format(printf, 2, 0)));
int vsnprintf(char* buffer, size_t, char const* fmt, va_list) __attribute__((format(printf, 3, 0)));
int vdprintf(int, char const* fmt, va_list) __attribute__((format(printf, 2, 0)));
int dprintf(int, char const* fmt, ...) __attribute__((format(printf, 2, 3)));
int fprintf(FILE*, char const* fmt, ...) __attribute__((format(printf, 2, 3)));
int printf(char const* fmt, ...) __attribute__((format(printf, 1, 2)));
void dbgputstr(char const*, size_t);