360 lines
10 KiB
C
360 lines
10 KiB
C
#include <defs.h>
|
|
#include <x86.h>
|
|
#include <error.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
/* *
|
|
* Space or zero padding and a field width are supported for the numeric
|
|
* formats only.
|
|
*
|
|
* The special format %e takes an integer error code
|
|
* and prints a string describing the error.
|
|
* The integer may be positive or negative,
|
|
* so that -E_NO_MEM and E_NO_MEM are equivalent.
|
|
* */
|
|
|
|
static const char * const error_string[MAXERROR + 1] = {
|
|
[0] NULL,
|
|
[E_UNSPECIFIED] "unspecified error",
|
|
[E_BAD_PROC] "bad process",
|
|
[E_INVAL] "invalid parameter",
|
|
[E_NO_MEM] "out of memory",
|
|
[E_NO_FREE_PROC] "out of processes",
|
|
[E_FAULT] "segmentation fault",
|
|
[E_INVAL_ELF] "invalid elf file",
|
|
[E_KILLED] "process is killed",
|
|
[E_PANIC] "panic failure",
|
|
[E_NO_DEV] "no such device",
|
|
[E_NA_DEV] "device not available",
|
|
[E_BUSY] "device/file is busy",
|
|
[E_NOENT] "no such file or directory",
|
|
[E_ISDIR] "is a directory",
|
|
[E_NOTDIR] "not a directory",
|
|
[E_XDEV] "cross device link",
|
|
[E_UNIMP] "unimplemented feature",
|
|
[E_SEEK] "illegal seek",
|
|
[E_MAX_OPEN] "too many files are open",
|
|
[E_EXISTS] "file or directory already exists",
|
|
[E_NOTEMPTY] "directory is not empty",
|
|
};
|
|
|
|
/* *
|
|
* printnum - print a number (base <= 16) in reverse order
|
|
* @putch: specified putch function, print a single character
|
|
* @fd: file descriptor
|
|
* @putdat: used by @putch function
|
|
* @num: the number will be printed
|
|
* @base: base for print, must be in [1, 16]
|
|
* @width: maximum number of digits, if the actual width is less than @width, use @padc instead
|
|
* @padc: character that padded on the left if the actual width is less than @width
|
|
* */
|
|
static void
|
|
printnum(void (*putch)(int, void*, int), int fd, void *putdat,
|
|
unsigned long long num, unsigned base, int width, int padc) {
|
|
unsigned long long result = num;
|
|
unsigned mod = do_div(result, base);
|
|
|
|
// first recursively print all preceding (more significant) digits
|
|
if (num >= base) {
|
|
printnum(putch, fd, putdat, result, base, width - 1, padc);
|
|
} else {
|
|
// print any needed pad characters before first digit
|
|
while (-- width > 0)
|
|
putch(padc, putdat, fd);
|
|
}
|
|
// then print this (the least significant) digit
|
|
putch("0123456789abcdef"[mod], putdat, fd);
|
|
}
|
|
|
|
/* *
|
|
* getuint - get an unsigned int of various possible sizes from a varargs list
|
|
* @ap: a varargs list pointer
|
|
* @lflag: determines the size of the vararg that @ap points to
|
|
* */
|
|
static unsigned long long
|
|
getuint(va_list *ap, int lflag) {
|
|
if (lflag >= 2) {
|
|
return va_arg(*ap, unsigned long long);
|
|
}
|
|
else if (lflag) {
|
|
return va_arg(*ap, unsigned long);
|
|
}
|
|
else {
|
|
return va_arg(*ap, unsigned int);
|
|
}
|
|
}
|
|
|
|
/* *
|
|
* getint - same as getuint but signed, we can't use getuint because of sign extension
|
|
* @ap: a varargs list pointer
|
|
* @lflag: determines the size of the vararg that @ap points to
|
|
* */
|
|
static long long
|
|
getint(va_list *ap, int lflag) {
|
|
if (lflag >= 2) {
|
|
return va_arg(*ap, long long);
|
|
}
|
|
else if (lflag) {
|
|
return va_arg(*ap, long);
|
|
}
|
|
else {
|
|
return va_arg(*ap, int);
|
|
}
|
|
}
|
|
|
|
/* *
|
|
* printfmt - format a string and print it by using putch
|
|
* @putch: specified putch function, print a single character
|
|
* @fd: file descriptor
|
|
* @putdat: used by @putch function
|
|
* @fmt: the format string to use
|
|
* */
|
|
void
|
|
printfmt(void (*putch)(int, void*, int), int fd, void *putdat, const char *fmt, ...) {
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
vprintfmt(putch, fd, putdat, fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
/* *
|
|
* vprintfmt - format a string and print it by using putch, it's called with a va_list
|
|
* instead of a variable number of arguments
|
|
* @fd: file descriptor
|
|
* @putch: specified putch function, print a single character
|
|
* @putdat: used by @putch function
|
|
* @fmt: the format string to use
|
|
* @ap: arguments for the format string
|
|
*
|
|
* Call this function if you are already dealing with a va_list.
|
|
* Or you probably want printfmt() instead.
|
|
* */
|
|
void
|
|
vprintfmt(void (*putch)(int, void*, int), int fd, void *putdat, const char *fmt, va_list ap) {
|
|
register const char *p;
|
|
register int ch, err;
|
|
unsigned long long num;
|
|
int base, width, precision, lflag, altflag;
|
|
|
|
while (1) {
|
|
while ((ch = *(unsigned char *)fmt ++) != '%') {
|
|
if (ch == '\0') {
|
|
return;
|
|
}
|
|
putch(ch, putdat, fd);
|
|
}
|
|
|
|
// Process a %-escape sequence
|
|
char padc = ' ';
|
|
width = precision = -1;
|
|
lflag = altflag = 0;
|
|
|
|
reswitch:
|
|
switch (ch = *(unsigned char *)fmt ++) {
|
|
|
|
// flag to pad on the right
|
|
case '-':
|
|
padc = '-';
|
|
goto reswitch;
|
|
|
|
// flag to pad with 0's instead of spaces
|
|
case '0':
|
|
padc = '0';
|
|
goto reswitch;
|
|
|
|
// width field
|
|
case '1' ... '9':
|
|
for (precision = 0; ; ++ fmt) {
|
|
precision = precision * 10 + ch - '0';
|
|
ch = *fmt;
|
|
if (ch < '0' || ch > '9') {
|
|
break;
|
|
}
|
|
}
|
|
goto process_precision;
|
|
|
|
case '*':
|
|
precision = va_arg(ap, int);
|
|
goto process_precision;
|
|
|
|
case '.':
|
|
if (width < 0)
|
|
width = 0;
|
|
goto reswitch;
|
|
|
|
case '#':
|
|
altflag = 1;
|
|
goto reswitch;
|
|
|
|
process_precision:
|
|
if (width < 0)
|
|
width = precision, precision = -1;
|
|
goto reswitch;
|
|
|
|
// long flag (doubled for long long)
|
|
case 'l':
|
|
lflag ++;
|
|
goto reswitch;
|
|
|
|
// character
|
|
case 'c':
|
|
putch(va_arg(ap, int), putdat, fd);
|
|
break;
|
|
|
|
// error message
|
|
case 'e':
|
|
err = va_arg(ap, int);
|
|
if (err < 0) {
|
|
err = -err;
|
|
}
|
|
if (err > MAXERROR || (p = error_string[err]) == NULL) {
|
|
printfmt(putch, fd, putdat, "error %d", err);
|
|
}
|
|
else {
|
|
printfmt(putch, fd, putdat, "%s", p);
|
|
}
|
|
break;
|
|
|
|
// string
|
|
case 's':
|
|
if ((p = va_arg(ap, char *)) == NULL) {
|
|
p = "(null)";
|
|
}
|
|
if (width > 0 && padc != '-') {
|
|
for (width -= strnlen(p, precision); width > 0; width --) {
|
|
putch(padc, putdat, fd);
|
|
}
|
|
}
|
|
for (; (ch = *p ++) != '\0' && (precision < 0 || -- precision >= 0); width --) {
|
|
if (altflag && (ch < ' ' || ch > '~')) {
|
|
putch('?', putdat, fd);
|
|
}
|
|
else {
|
|
putch(ch, putdat, fd);
|
|
}
|
|
}
|
|
for (; width > 0; width --) {
|
|
putch(' ', putdat, fd);
|
|
}
|
|
break;
|
|
|
|
// (signed) decimal
|
|
case 'd':
|
|
num = getint(&ap, lflag);
|
|
if ((long long)num < 0) {
|
|
putch('-', putdat, fd);
|
|
num = -(long long)num;
|
|
}
|
|
base = 10;
|
|
goto number;
|
|
|
|
// unsigned decimal
|
|
case 'u':
|
|
num = getuint(&ap, lflag);
|
|
base = 10;
|
|
goto number;
|
|
|
|
// (unsigned) octal
|
|
case 'o':
|
|
num = getuint(&ap, lflag);
|
|
base = 8;
|
|
goto number;
|
|
|
|
// pointer
|
|
case 'p':
|
|
putch('0', putdat, fd);
|
|
putch('x', putdat, fd);
|
|
num = (unsigned long long)(uintptr_t)va_arg(ap, void *);
|
|
base = 16;
|
|
goto number;
|
|
|
|
// (unsigned) hexadecimal
|
|
case 'x':
|
|
num = getuint(&ap, lflag);
|
|
base = 16;
|
|
number:
|
|
printnum(putch, fd, putdat, num, base, width, padc);
|
|
break;
|
|
|
|
// escaped '%' character
|
|
case '%':
|
|
putch(ch, putdat, fd);
|
|
break;
|
|
|
|
// unrecognized escape sequence - just print it literally
|
|
default:
|
|
putch('%', putdat, fd);
|
|
for (fmt --; fmt[-1] != '%'; fmt --)
|
|
/* do nothing */;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* sprintbuf is used to save enough information of a buffer */
|
|
struct sprintbuf {
|
|
char *buf; // address pointer points to the first unused memory
|
|
char *ebuf; // points the end of the buffer
|
|
int cnt; // the number of characters that have been placed in this buffer
|
|
};
|
|
|
|
/* *
|
|
* sprintputch - 'print' a single character in a buffer
|
|
* @ch: the character will be printed
|
|
* @b: the buffer to place the character @ch
|
|
* */
|
|
static void
|
|
sprintputch(int ch, struct sprintbuf *b) {
|
|
b->cnt ++;
|
|
if (b->buf < b->ebuf) {
|
|
*b->buf ++ = ch;
|
|
}
|
|
}
|
|
|
|
/* *
|
|
* snprintf - format a string and place it in a buffer
|
|
* @str: the buffer to place the result into
|
|
* @size: the size of buffer, including the trailing null space
|
|
* @fmt: the format string to use
|
|
* */
|
|
int
|
|
snprintf(char *str, size_t size, const char *fmt, ...) {
|
|
va_list ap;
|
|
int cnt;
|
|
va_start(ap, fmt);
|
|
cnt = vsnprintf(str, size, fmt, ap);
|
|
va_end(ap);
|
|
return cnt;
|
|
}
|
|
|
|
/* *
|
|
* vsnprintf - format a string and place it in a buffer, it's called with a va_list
|
|
* instead of a variable number of arguments
|
|
* @str: the buffer to place the result into
|
|
* @size: the size of buffer, including the trailing null space
|
|
* @fmt: the format string to use
|
|
* @ap: arguments for the format string
|
|
*
|
|
* The return value is the number of characters which would be generated for the
|
|
* given input, excluding the trailing '\0'.
|
|
*
|
|
* Call this function if you are already dealing with a va_list.
|
|
* Or you probably want snprintf() instead.
|
|
* */
|
|
int
|
|
vsnprintf(char *str, size_t size, const char *fmt, va_list ap) {
|
|
struct sprintbuf b = {str, str + size - 1, 0};
|
|
if (str == NULL || b.buf > b.ebuf) {
|
|
return -E_INVAL;
|
|
}
|
|
// print the string to the buffer
|
|
vprintfmt((void*)sprintputch, NO_FD, &b, fmt, ap);
|
|
// null terminate the buffer
|
|
*b.buf = '\0';
|
|
return b.cnt;
|
|
}
|
|
|