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LibC: Implement setbuf() and setvbuf()

This commit is contained in:
Bananymous 2024-08-01 01:30:00 +03:00
parent c440204fa5
commit 401b460d75
1 changed files with 61 additions and 41 deletions
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96
userspace/libraries/LibC/stdio.cpp
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@ -1,5 +1,6 @@
#include <BAN/Assert.h>
#include <BAN/Debug.h>
#include <BAN/Math.h>
#include <bits/printf.h>
#include <errno.h>
@ -16,12 +17,15 @@ struct FILE
{
int fd { -1 };
mode_t mode { 0 };
int buffer_type { _IOLBF };
bool eof { false };
bool error { false };
int pid { -1 };
unsigned char buffer[BUFSIZ] {};
unsigned char inline_buffer_storage[BUFSIZ] {};
unsigned char* buffer = inline_buffer_storage;
uint32_t buffer_size = BUFSIZ;
uint32_t buffer_index { 0 };
};
@ -44,7 +48,7 @@ struct ScopeLock
static FILE s_files[FOPEN_MAX] {
{ .fd = STDIN_FILENO, .mode = O_RDONLY },
{ .fd = STDOUT_FILENO, .mode = O_WRONLY },
{ .fd = STDERR_FILENO, .mode = O_WRONLY },
{ .fd = STDERR_FILENO, .mode = O_WRONLY, .buffer_type = _IONBF },
{ .fd = STDDBG_FILENO, .mode = O_WRONLY },
};
@ -73,7 +77,7 @@ int fclose(FILE* file)
ScopeLock _(file);
(void)fflush(file);
int ret = (close(file->fd) == -1) ? EOF : 0;
file->fd = -1;
file = {};
return ret;
}
@ -104,20 +108,19 @@ FILE* fdopen(int fd, const char* mode_str)
errno = EINVAL;
return nullptr;
}
mode &= ~O_TRUNC;
// FIXME: when threads are implemented
for (int i = 0; i < FOPEN_MAX; i++)
{
if (s_files[i].fd == -1)
{
s_files[i] = {
.fd = fd,
.mode = mode & O_ACCMODE,
};
ScopeLock _(&s_files[i]);
if (s_files[i].fd != -1)
continue;
s_files[i].fd = fd;
s_files[i].mode = mode & O_ACCMODE;
ASSERT(s_files[i].buffer == s_files[i].inline_buffer_storage);
ASSERT(s_files[i].buffer_size == BUFSIZ);
return &s_files[i];
}
}
errno = EMFILE;
return nullptr;
@ -229,15 +232,15 @@ FILE* fopen(const char* pathname, const char* mode_str)
// FIXME: when threads are implemented
for (int i = 0; i < FOPEN_MAX; i++)
{
if (s_files[i].fd == -1)
{
s_files[i] = {
.fd = fd,
.mode = mode & O_ACCMODE
};
ScopeLock _(&s_files[i]);
if (s_files[i].fd != -1)
continue;
s_files[i].fd = fd;
s_files[i].mode = mode & O_ACCMODE;
ASSERT(s_files[i].buffer == s_files[i].inline_buffer_storage);
ASSERT(s_files[i].buffer_size == BUFSIZ);
return &s_files[i];
}
}
errno = EMFILE;
return nullptr;
@ -308,11 +311,9 @@ FILE* freopen(const char* pathname, const char* mode_str, FILE* file)
ScopeLock _(file);
(void)fflush(file);
if (pathname)
{
close(file->fd);
fclose(file);
file->fd = open(pathname, mode, 0666);
file->mode = mode & O_ACCMODE;
if (file->fd == -1)
@ -320,15 +321,13 @@ FILE* freopen(const char* pathname, const char* mode_str, FILE* file)
}
else
{
mode &= O_ACCMODE;
if ((file->mode & mode) != mode)
{
close(file->fd);
file->fd = -1;
fclose(file);
errno = EBADF;
return nullptr;
}
file->mode = mode;
file->mode = mode & O_ACCMODE;
}
return file;
@ -537,16 +536,16 @@ FILE* popen(const char* command, const char* mode_str)
// FIXME: when threads are implemented
for (int i = 0; i < FOPEN_MAX; i++)
{
if (s_files[i].fd == -1)
{
s_files[i] = {
.fd = read ? fds[0] : fds[1],
.mode = (unsigned)(read ? O_RDONLY : O_WRONLY),
.pid = pid
};
ScopeLock _(&s_files[i]);
if (s_files[i].fd != -1)
continue;
s_files[i].fd = read ? fds[0] : fds[1];
s_files[i].mode = (unsigned)(read ? O_RDONLY : O_WRONLY);
s_files[i].pid = pid;
ASSERT(s_files[i].buffer == s_files[i].inline_buffer_storage);
ASSERT(s_files[i].buffer_size == BUFSIZ);
return &s_files[i];
}
}
errno = EMFILE;
return nullptr;
@ -574,7 +573,7 @@ int putchar(int c)
int putc_unlocked(int c, FILE* file)
{
file->buffer[file->buffer_index++] = c;
if (c == '\n' || file->buffer_index == sizeof(file->buffer))
if (file->buffer_type == _IONBF || (file->buffer_type == _IOLBF && c == '\n') || file->buffer_index >= file->buffer_size)
if (fflush(file) == EOF)
return EOF;
return (unsigned char)c;
@ -628,11 +627,32 @@ int scanf(const char* format, ...)
return ret;
}
// TODO
void setbuf(FILE*, char*);
void setbuf(FILE* file, char* buffer)
{
int type = buffer ? _IOFBF : _IONBF;
setvbuf(file, buffer, type, BUFSIZ);
}
// TODO
int setvbuf(FILE*, char*, int, size_t);
int setvbuf(FILE* file, char* buffer, int type, size_t size)
{
if (file->fd == -1)
{
errno = EBADF;
return -1;
}
if (buffer == nullptr)
{
buffer = reinterpret_cast<char*>(file->inline_buffer_storage);
size = BAN::Math::min<size_t>(size, BUFSIZ);
}
file->buffer_type = type;
file->buffer_size = size;
file->buffer = reinterpret_cast<unsigned char*>(buffer);
return 0;
}
int snprintf(char* buffer, size_t max_size, const char* format, ...)
{