banan-os/libc/stdio.cpp

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#include <bits/printf.h>
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#include <errno.h>
#include <fcntl.h>
#include <scanf_impl.h>
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#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <sys/syscall.h>
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#include <unistd.h>
struct FILE
{
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int fd { -1 };
bool eof { false };
bool error { false };
unsigned char buffer[BUFSIZ] {};
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uint32_t buffer_index { 0 };
};
static FILE s_files[FOPEN_MAX] {
{ .fd = STDIN_FILENO },
{ .fd = STDOUT_FILENO },
{ .fd = STDERR_FILENO },
{ .fd = STDDBG_FILENO },
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};
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FILE* stdin = &s_files[0];
FILE* stdout = &s_files[1];
FILE* stderr = &s_files[2];
FILE* stddbg = &s_files[3];
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void clearerr(FILE* file)
{
file->eof = false;
file->error = false;
}
char* ctermid(char* buffer)
{
static char s_buffer[L_ctermid];
char* target = buffer ? buffer : s_buffer;
syscall(SYS_TERMID, target);
return target;
}
int fclose(FILE* file)
{
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if (close(file->fd) == -1)
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return EOF;
file->fd = -1;
return 0;
}
FILE* fdopen(int fd, const char* mode)
{
// FIXME
(void)mode;
for (int i = 0; i < FOPEN_MAX; i++)
{
if (s_files[i].fd == -1)
{
s_files[i] = { .fd = fd };
return &s_files[i];
}
}
errno = EMFILE;
return nullptr;
}
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int feof(FILE* file)
{
return file->eof;
}
int ferror(FILE* file)
{
return file->error;
}
int fflush(FILE* file)
{
if (file == nullptr)
{
for (int i = 0; i < FOPEN_MAX; i++)
if (s_files[i].fd != -1)
if (int ret = fflush(&s_files[i]); ret != 0)
return ret;
return 0;
}
if (file->buffer_index == 0)
return 0;
if (syscall(SYS_WRITE, file->fd, file->buffer, file->buffer_index) < 0)
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{
file->error = true;
return EOF;
}
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file->buffer_index = 0;
return 0;
}
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int fgetc(FILE* file)
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{
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if (file->eof)
return EOF;
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unsigned char c;
long ret = syscall(SYS_READ, file->fd, &c, 1);
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if (ret < 0)
{
file->error = true;
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return EOF;
}
if (ret == 0)
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{
file->eof = true;
return EOF;
}
return c;
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}
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int fgetpos(FILE* file, fpos_t* pos)
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{
off_t offset = ftello(file);
if (offset == -1)
return -1;
*pos = offset;
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return 0;
}
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char* fgets(char* str, int size, FILE* file)
{
if (size == 0)
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return nullptr;
int i = 0;
for (; i < size - 1; i++)
{
char c = fgetc(file);
if (c == EOF)
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{
if (i == 0)
return nullptr;
break;
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}
str[i] = c;
if (c == '\n')
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{
i++;
break;
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}
}
str[i] = '\0';
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return str;
}
int fileno(FILE* fp)
{
if (fp == nullptr)
return EBADF;
return fp->fd;
}
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// TODO
void flockfile(FILE*);
FILE* fopen(const char* pathname, const char* mode)
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{
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uint8_t flags = 0;
if (mode[0] == 'r')
flags |= O_RDONLY;
else if (mode[0] == 'w')
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flags |= O_WRONLY | O_CREAT | O_TRUNC;
else if (mode[0] == 'a')
flags |= O_WRONLY | O_CREAT | O_APPEND;
else
{
errno = EINVAL;
return nullptr;
}
if (mode[1] && mode[2] && mode[1] == mode[2])
{
errno = EINVAL;
return nullptr;
}
for (int i = 1; i <= 2; i++)
{
if (mode[i] == 0)
break;
else if (mode[i] == '+')
flags |= O_RDWR;
else if (mode[i] == 'b')
continue;
else
{
errno = EINVAL;
return nullptr;
}
}
int fd = open(pathname, flags);
if (fd == -1)
return nullptr;
for (int i = 0; i < FOPEN_MAX; i++)
{
if (s_files[i].fd == -1)
{
s_files[i] = { .fd = fd };
return &s_files[i];
}
}
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errno = EMFILE;
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return nullptr;
}
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int fprintf(FILE* file, const char* format, ...)
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{
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va_list arguments;
va_start(arguments, format);
int ret = vfprintf(file, format, arguments);
va_end(arguments);
return ret;
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}
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int fputc(int c, FILE* file)
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{
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file->buffer[file->buffer_index++] = c;
if (c == '\n' || file->buffer_index == sizeof(file->buffer))
if (fflush(file) == EOF)
return EOF;
return (unsigned char)c;
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}
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int fputs(const char* str, FILE* file)
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{
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while (*str)
{
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if (fputc(*str, file) == EOF)
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return EOF;
str++;
}
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return 0;
}
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size_t fread(void* buffer, size_t size, size_t nitems, FILE* file)
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{
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if (file->eof || nitems * size == 0)
return 0;
size_t target = size * nitems;
size_t nread = 0;
while (nread < target)
{
ssize_t ret = syscall(SYS_READ, file->fd, (uint8_t*)buffer + nread, target - nread);
if (ret < 0)
file->error = true;
else if (ret == 0)
file->eof = true;
if (ret <= 0)
return nread;
nread += ret;
}
return nread / size;
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}
// TODO
FILE* freopen(const char*, const char*, FILE*);
int fscanf(FILE* file, const char* format, ...)
{
va_list arguments;
va_start(arguments, format);
int ret = vfscanf(file, format, arguments);
va_end(arguments);
return ret;
}
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int fseek(FILE* file, long offset, int whence)
{
return fseeko(file, offset, whence);
}
int fseeko(FILE* file, off_t offset, int whence)
{
long ret = syscall(SYS_SEEK, file->fd, offset, whence);
if (ret < 0)
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return -1;
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file->eof = false;
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return 0;
}
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int fsetpos(FILE* file, const fpos_t* pos)
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{
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return fseek(file, *pos, SEEK_SET);
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}
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long ftell(FILE* file)
{
return ftello(file);
}
off_t ftello(FILE* file)
{
long ret = syscall(SYS_TELL, file->fd);
if (ret < 0)
return -1;
return ret;
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}
// TODO
int ftrylockfile(FILE*);
// TODO
void funlockfile(FILE*);
size_t fwrite(const void* buffer, size_t size, size_t nitems, FILE* file)
{
unsigned char* ubuffer = (unsigned char*)buffer;
for (size_t byte = 0; byte < nitems * size; byte++)
if (fputc(ubuffer[byte], file) == EOF)
return byte / size;
return nitems;
}
int getc(FILE* file)
{
return fgetc(file);
}
int getchar(void)
{
return getc(stdin);
}
// TODO
int getc_unlocked(FILE*);
// TODO
int getchar_unlocked(void);
char* gets(char* buffer)
{
if (stdin->eof)
return nullptr;
unsigned char* ubuffer = (unsigned char*)buffer;
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int first = fgetc(stdin);
if (first == EOF)
return nullptr;
*ubuffer++ = first;
for (;;)
{
int c = fgetc(stdin);
if (c == '\n' || c == EOF)
{
*ubuffer++ = '\0';
return buffer;
}
*ubuffer++ = c;
}
}
// TODO
int pclose(FILE*);
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void perror(const char* string)
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{
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if (string && *string)
{
fputs(string, stderr);
fputs(": ", stderr);
}
fputs(strerror(errno), stderr);
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fputc('\n', stderr);
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stderr->error = true;
}
// TODO
FILE* popen(const char*, const char*);
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int printf(const char* format, ...)
{
va_list arguments;
va_start(arguments, format);
int ret = vfprintf(stdout, format, arguments);
va_end(arguments);
return ret;
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}
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int putc(int c, FILE* file)
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{
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return fputc(c, file);
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}
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int putchar(int c)
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{
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return putc(c, stdout);
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}
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// TODO
int putc_unlocked(int, FILE*);
// TODO
int putchar_unlocked(int);
int puts(const char* string)
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{
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if (fputs(string, stdout) == EOF)
return EOF;
if (fputc('\n', stdout) == EOF)
return EOF;
return 0;
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}
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int remove(const char* path)
{
struct stat st;
if (stat(path, &st) == -1)
return -1;
if (S_ISDIR(st.st_mode))
return rmdir(path);
return unlink(path);
}
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// TODO
int rename(const char*, const char*);
// TODO
void rewind(FILE*);
int scanf(const char* format, ...)
{
va_list arguments;
va_start(arguments, format);
int ret = vscanf(format, arguments);
va_end(arguments);
return ret;
}
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// TODO
void setbuf(FILE*, char*);
// TODO
int setvbuf(FILE*, char*, int, size_t);
int snprintf(char* buffer, size_t max_size, const char* format, ...)
{
va_list arguments;
va_start(arguments, format);
int ret = vsnprintf(buffer, max_size, format, arguments);
va_end(arguments);
return ret;
}
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int sprintf(char* buffer, const char* format, ...)
{
va_list arguments;
va_start(arguments, format);
int ret = vsprintf(buffer, format, arguments);
va_end(arguments);
return ret;
}
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int sscanf(const char* s, const char* format, ...)
{
va_list arguments;
va_start(arguments, format);
int ret = vsscanf(s, format, arguments);
va_end(arguments);
return ret;
}
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// TODO
char* tempnam(const char*, const char*);
// TODO
FILE* tmpfile(void);
// TODO
char* tmpnam(char*);
// TODO
int ungetc(int, FILE*);
int vfprintf(FILE* file, const char* format, va_list arguments)
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{
return printf_impl(format, arguments, [](int c, void* file) { return fputc(c, static_cast<FILE*>(file)); }, file);
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}
int vfscanf(FILE* file, const char* format, va_list arguments)
{
return scanf_impl(format, arguments, [](void* file) { return fgetc(static_cast<FILE*>(file)); }, file);
}
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int vprintf(const char* format, va_list arguments)
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{
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return vfprintf(stdout, format, arguments);
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}
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int vscanf(const char* format, va_list arguments)
{
return vfscanf(stdin, format, arguments);
}
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int vsnprintf(char* buffer, size_t max_size, const char* format, va_list arguments)
{
if (buffer == nullptr)
return printf_impl(format, arguments, [](int, void*) { return 0; }, nullptr);
struct print_info
{
char* buffer;
size_t remaining;
};
print_info info { buffer, max_size };
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int ret = printf_impl(format, arguments,
[](int c, void* _info)
{
print_info* info = (print_info*)_info;
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if (info->remaining == 1)
{
*info->buffer = '\0';
info->remaining = 0;
}
else if (info->remaining)
{
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*info->buffer = c;
info->buffer++;
info->remaining--;
}
return 0;
}, &info
);
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*info.buffer = '\0';
return ret;
}
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int vsprintf(char* buffer, const char* format, va_list arguments)
{
if (buffer == nullptr)
return printf_impl(format, arguments, [](int, void*) { return 0; }, nullptr);
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int ret = printf_impl(format, arguments,
[](int c, void* _buffer)
{
*(*(char**)_buffer)++ = c;
return 0;
}, &buffer
);
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*buffer = '\0';
return ret;
}
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int vsscanf(const char* s, const char* format, va_list arguments)
{
return scanf_impl(format, arguments,
[](void* data) -> int
{
char ret = **static_cast<char**>(data);
(*static_cast<char**>(data))++;
if (ret == '\0')
return -1;
return ret;
}, &s
);
}