0,0 → 1,1379 |
/* |
* linux/lib/vsprintf.c |
* |
* Copyright (C) 1991, 1992 Linus Torvalds |
*/ |
|
/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ |
/* |
* Wirzenius wrote this portably, Torvalds fucked it up :-) |
*/ |
|
/* |
* Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com> |
* - changed to provide snprintf and vsnprintf functions |
* So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de> |
* - scnprintf and vscnprintf |
*/ |
|
#define likely(x) __builtin_expect(!!(x), 1) |
#define unlikely(x) __builtin_expect(!!(x), 0) |
|
#include <string.h> |
#include <ctype.h> |
#include <stdarg.h> |
#include <stdint.h> |
|
//#include <linux/module.h> |
//#include <types.h> |
//#include <linux/kernel.h> |
//#include <linux/kallsyms.h> |
//#include <linux/uaccess.h> |
//#include <linux/ioport.h> |
|
//#include <asm/page.h> /* for PAGE_SIZE */ |
//#include <asm/div64.h> |
//#include <asm/sections.h> /* for dereference_function_descriptor() */ |
|
#define do_div(n, base) \ |
({ \ |
unsigned long __upper, __low, __high, __mod, __base; \ |
__base = (base); \ |
asm("":"=a" (__low), "=d" (__high) : "A" (n)); \ |
__upper = __high; \ |
if (__high) { \ |
__upper = __high % (__base); \ |
__high = __high / (__base); \ |
} \ |
asm("divl %2":"=a" (__low), "=d" (__mod) \ |
: "rm" (__base), "0" (__low), "1" (__upper)); \ |
asm("":"=A" (n) : "a" (__low), "d" (__high)); \ |
__mod; \ |
}) |
|
#define EPERM 1 /* Operation not permitted */ |
#define ENOENT 2 /* No such file or directory */ |
#define ESRCH 3 /* No such process */ |
#define EINTR 4 /* Interrupted system call */ |
#define EIO 5 /* I/O error */ |
#define ENXIO 6 /* No such device or address */ |
#define E2BIG 7 /* Argument list too long */ |
#define ENOEXEC 8 /* Exec format error */ |
#define EBADF 9 /* Bad file number */ |
#define ECHILD 10 /* No child processes */ |
#define EAGAIN 11 /* Try again */ |
#define ENOMEM 12 /* Out of memory */ |
#define EACCES 13 /* Permission denied */ |
#define EFAULT 14 /* Bad address */ |
#define ENOTBLK 15 /* Block device required */ |
#define EBUSY 16 /* Device or resource busy */ |
#define EEXIST 17 /* File exists */ |
#define EXDEV 18 /* Cross-device link */ |
#define ENODEV 19 /* No such device */ |
#define ENOTDIR 20 /* Not a directory */ |
#define EISDIR 21 /* Is a directory */ |
#define EINVAL 22 /* Invalid argument */ |
#define ENFILE 23 /* File table overflow */ |
#define EMFILE 24 /* Too many open files */ |
#define ENOTTY 25 /* Not a typewriter */ |
#define ETXTBSY 26 /* Text file busy */ |
#define EFBIG 27 /* File too large */ |
#define ENOSPC 28 /* No space left on device */ |
#define ESPIPE 29 /* Illegal seek */ |
#define EROFS 30 /* Read-only file system */ |
#define EMLINK 31 /* Too many links */ |
#define EPIPE 32 /* Broken pipe */ |
#define EDOM 33 /* Math argument out of domain of func */ |
#define ERANGE 34 /* Math result not representable */ |
|
#define PAGE_SIZE 4096 |
|
/* Works only for digits and letters, but small and fast */ |
#define TOLOWER(x) ((x) | 0x20) |
|
static unsigned int simple_guess_base(const char *cp) |
{ |
if (cp[0] == '0') { |
if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) |
return 16; |
else |
return 8; |
} else { |
return 10; |
} |
} |
|
/** |
* simple_strtoul - convert a string to an unsigned long |
* @cp: The start of the string |
* @endp: A pointer to the end of the parsed string will be placed here |
* @base: The number base to use |
*/ |
unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
{ |
unsigned long result = 0; |
|
if (!base) |
base = simple_guess_base(cp); |
|
if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
cp += 2; |
|
while (isxdigit(*cp)) { |
unsigned int value; |
|
value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; |
if (value >= base) |
break; |
result = result * base + value; |
cp++; |
} |
|
if (endp) |
*endp = (char *)cp; |
return result; |
} |
|
/** |
* simple_strtol - convert a string to a signed long |
* @cp: The start of the string |
* @endp: A pointer to the end of the parsed string will be placed here |
* @base: The number base to use |
*/ |
long simple_strtol(const char *cp, char **endp, unsigned int base) |
{ |
if(*cp == '-') |
return -simple_strtoul(cp + 1, endp, base); |
return simple_strtoul(cp, endp, base); |
} |
|
/** |
* simple_strtoull - convert a string to an unsigned long long |
* @cp: The start of the string |
* @endp: A pointer to the end of the parsed string will be placed here |
* @base: The number base to use |
*/ |
unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
{ |
unsigned long long result = 0; |
|
if (!base) |
base = simple_guess_base(cp); |
|
if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
cp += 2; |
|
while (isxdigit(*cp)) { |
unsigned int value; |
|
value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; |
if (value >= base) |
break; |
result = result * base + value; |
cp++; |
} |
|
if (endp) |
*endp = (char *)cp; |
return result; |
} |
|
/** |
* simple_strtoll - convert a string to a signed long long |
* @cp: The start of the string |
* @endp: A pointer to the end of the parsed string will be placed here |
* @base: The number base to use |
*/ |
long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
{ |
if(*cp=='-') |
return -simple_strtoull(cp + 1, endp, base); |
return simple_strtoull(cp, endp, base); |
} |
|
/** |
* strict_strtoul - convert a string to an unsigned long strictly |
* @cp: The string to be converted |
* @base: The number base to use |
* @res: The converted result value |
* |
* strict_strtoul converts a string to an unsigned long only if the |
* string is really an unsigned long string, any string containing |
* any invalid char at the tail will be rejected and -EINVAL is returned, |
* only a newline char at the tail is acceptible because people generally |
* change a module parameter in the following way: |
* |
* echo 1024 > /sys/module/e1000/parameters/copybreak |
* |
* echo will append a newline to the tail. |
* |
* It returns 0 if conversion is successful and *res is set to the converted |
* value, otherwise it returns -EINVAL and *res is set to 0. |
* |
* simple_strtoul just ignores the successive invalid characters and |
* return the converted value of prefix part of the string. |
*/ |
int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) |
{ |
char *tail; |
unsigned long val; |
size_t len; |
|
*res = 0; |
len = strlen(cp); |
if (len == 0) |
return -EINVAL; |
|
val = simple_strtoul(cp, &tail, base); |
if (tail == cp) |
return -EINVAL; |
if ((*tail == '\0') || |
((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { |
*res = val; |
return 0; |
} |
|
return -EINVAL; |
} |
|
/** |
* strict_strtol - convert a string to a long strictly |
* @cp: The string to be converted |
* @base: The number base to use |
* @res: The converted result value |
* |
* strict_strtol is similiar to strict_strtoul, but it allows the first |
* character of a string is '-'. |
* |
* It returns 0 if conversion is successful and *res is set to the converted |
* value, otherwise it returns -EINVAL and *res is set to 0. |
*/ |
int strict_strtol(const char *cp, unsigned int base, long *res) |
{ |
int ret; |
if (*cp == '-') { |
ret = strict_strtoul(cp + 1, base, (unsigned long *)res); |
if (!ret) |
*res = -(*res); |
} else { |
ret = strict_strtoul(cp, base, (unsigned long *)res); |
} |
|
return ret; |
} |
|
/** |
* strict_strtoull - convert a string to an unsigned long long strictly |
* @cp: The string to be converted |
* @base: The number base to use |
* @res: The converted result value |
* |
* strict_strtoull converts a string to an unsigned long long only if the |
* string is really an unsigned long long string, any string containing |
* any invalid char at the tail will be rejected and -EINVAL is returned, |
* only a newline char at the tail is acceptible because people generally |
* change a module parameter in the following way: |
* |
* echo 1024 > /sys/module/e1000/parameters/copybreak |
* |
* echo will append a newline to the tail of the string. |
* |
* It returns 0 if conversion is successful and *res is set to the converted |
* value, otherwise it returns -EINVAL and *res is set to 0. |
* |
* simple_strtoull just ignores the successive invalid characters and |
* return the converted value of prefix part of the string. |
*/ |
int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res) |
{ |
char *tail; |
unsigned long long val; |
size_t len; |
|
*res = 0; |
len = strlen(cp); |
if (len == 0) |
return -EINVAL; |
|
val = simple_strtoull(cp, &tail, base); |
if (tail == cp) |
return -EINVAL; |
if ((*tail == '\0') || |
((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { |
*res = val; |
return 0; |
} |
|
return -EINVAL; |
} |
|
/** |
* strict_strtoll - convert a string to a long long strictly |
* @cp: The string to be converted |
* @base: The number base to use |
* @res: The converted result value |
* |
* strict_strtoll is similiar to strict_strtoull, but it allows the first |
* character of a string is '-'. |
* |
* It returns 0 if conversion is successful and *res is set to the converted |
* value, otherwise it returns -EINVAL and *res is set to 0. |
*/ |
int strict_strtoll(const char *cp, unsigned int base, long long *res) |
{ |
int ret; |
if (*cp == '-') { |
ret = strict_strtoull(cp + 1, base, (unsigned long long *)res); |
if (!ret) |
*res = -(*res); |
} else { |
ret = strict_strtoull(cp, base, (unsigned long long *)res); |
} |
|
return ret; |
} |
|
static int skip_atoi(const char **s) |
{ |
int i=0; |
|
while (isdigit(**s)) |
i = i*10 + *((*s)++) - '0'; |
return i; |
} |
|
/* Decimal conversion is by far the most typical, and is used |
* for /proc and /sys data. This directly impacts e.g. top performance |
* with many processes running. We optimize it for speed |
* using code from |
* http://www.cs.uiowa.edu/~jones/bcd/decimal.html |
* (with permission from the author, Douglas W. Jones). */ |
|
/* Formats correctly any integer in [0,99999]. |
* Outputs from one to five digits depending on input. |
* On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ |
static char* put_dec_trunc(char *buf, unsigned q) |
{ |
unsigned d3, d2, d1, d0; |
d1 = (q>>4) & 0xf; |
d2 = (q>>8) & 0xf; |
d3 = (q>>12); |
|
d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
q = (d0 * 0xcd) >> 11; |
d0 = d0 - 10*q; |
*buf++ = d0 + '0'; /* least significant digit */ |
d1 = q + 9*d3 + 5*d2 + d1; |
if (d1 != 0) { |
q = (d1 * 0xcd) >> 11; |
d1 = d1 - 10*q; |
*buf++ = d1 + '0'; /* next digit */ |
|
d2 = q + 2*d2; |
if ((d2 != 0) || (d3 != 0)) { |
q = (d2 * 0xd) >> 7; |
d2 = d2 - 10*q; |
*buf++ = d2 + '0'; /* next digit */ |
|
d3 = q + 4*d3; |
if (d3 != 0) { |
q = (d3 * 0xcd) >> 11; |
d3 = d3 - 10*q; |
*buf++ = d3 + '0'; /* next digit */ |
if (q != 0) |
*buf++ = q + '0'; /* most sign. digit */ |
} |
} |
} |
return buf; |
} |
/* Same with if's removed. Always emits five digits */ |
static char* put_dec_full(char *buf, unsigned q) |
{ |
/* BTW, if q is in [0,9999], 8-bit ints will be enough, */ |
/* but anyway, gcc produces better code with full-sized ints */ |
unsigned d3, d2, d1, d0; |
d1 = (q>>4) & 0xf; |
d2 = (q>>8) & 0xf; |
d3 = (q>>12); |
|
/* Possible ways to approx. divide by 10 */ |
/* gcc -O2 replaces multiply with shifts and adds */ |
// (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) |
// (x * 0x67) >> 10: 1100111 |
// (x * 0x34) >> 9: 110100 - same |
// (x * 0x1a) >> 8: 11010 - same |
// (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) |
|
d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
q = (d0 * 0xcd) >> 11; |
d0 = d0 - 10*q; |
*buf++ = d0 + '0'; |
d1 = q + 9*d3 + 5*d2 + d1; |
q = (d1 * 0xcd) >> 11; |
d1 = d1 - 10*q; |
*buf++ = d1 + '0'; |
|
d2 = q + 2*d2; |
q = (d2 * 0xd) >> 7; |
d2 = d2 - 10*q; |
*buf++ = d2 + '0'; |
|
d3 = q + 4*d3; |
q = (d3 * 0xcd) >> 11; /* - shorter code */ |
/* q = (d3 * 0x67) >> 10; - would also work */ |
d3 = d3 - 10*q; |
*buf++ = d3 + '0'; |
*buf++ = q + '0'; |
return buf; |
} |
/* No inlining helps gcc to use registers better */ |
static char* put_dec(char *buf, unsigned long long num) |
{ |
while (1) { |
unsigned rem; |
if (num < 100000) |
return put_dec_trunc(buf, num); |
rem = do_div(num, 100000); |
buf = put_dec_full(buf, rem); |
} |
} |
|
#define ZEROPAD 1 /* pad with zero */ |
#define SIGN 2 /* unsigned/signed long */ |
#define PLUS 4 /* show plus */ |
#define SPACE 8 /* space if plus */ |
#define LEFT 16 /* left justified */ |
#define SMALL 32 /* Must be 32 == 0x20 */ |
#define SPECIAL 64 /* 0x */ |
|
enum format_type { |
FORMAT_TYPE_NONE, /* Just a string part */ |
FORMAT_TYPE_WIDTH, |
FORMAT_TYPE_PRECISION, |
FORMAT_TYPE_CHAR, |
FORMAT_TYPE_STR, |
FORMAT_TYPE_PTR, |
FORMAT_TYPE_PERCENT_CHAR, |
FORMAT_TYPE_INVALID, |
FORMAT_TYPE_LONG_LONG, |
FORMAT_TYPE_ULONG, |
FORMAT_TYPE_LONG, |
FORMAT_TYPE_UBYTE, |
FORMAT_TYPE_BYTE, |
FORMAT_TYPE_USHORT, |
FORMAT_TYPE_SHORT, |
FORMAT_TYPE_UINT, |
FORMAT_TYPE_INT, |
FORMAT_TYPE_NRCHARS, |
FORMAT_TYPE_SIZE_T, |
FORMAT_TYPE_PTRDIFF |
}; |
|
struct printf_spec { |
enum format_type type; |
int flags; /* flags to number() */ |
int field_width; /* width of output field */ |
int base; |
int precision; /* # of digits/chars */ |
int qualifier; |
}; |
|
static char *number(char *buf, char *end, unsigned long long num, |
struct printf_spec spec) |
{ |
/* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ |
|
char tmp[66]; |
char sign; |
char locase; |
int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
int i; |
|
/* locase = 0 or 0x20. ORing digits or letters with 'locase' |
* produces same digits or (maybe lowercased) letters */ |
locase = (spec.flags & SMALL); |
if (spec.flags & LEFT) |
spec.flags &= ~ZEROPAD; |
sign = 0; |
if (spec.flags & SIGN) { |
if ((signed long long) num < 0) { |
sign = '-'; |
num = - (signed long long) num; |
spec.field_width--; |
} else if (spec.flags & PLUS) { |
sign = '+'; |
spec.field_width--; |
} else if (spec.flags & SPACE) { |
sign = ' '; |
spec.field_width--; |
} |
} |
if (need_pfx) { |
spec.field_width--; |
if (spec.base == 16) |
spec.field_width--; |
} |
|
/* generate full string in tmp[], in reverse order */ |
i = 0; |
if (num == 0) |
tmp[i++] = '0'; |
/* Generic code, for any base: |
else do { |
tmp[i++] = (digits[do_div(num,base)] | locase); |
} while (num != 0); |
*/ |
else if (spec.base != 10) { /* 8 or 16 */ |
int mask = spec.base - 1; |
int shift = 3; |
if (spec.base == 16) shift = 4; |
do { |
tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
num >>= shift; |
} while (num); |
} else { /* base 10 */ |
i = put_dec(tmp, num) - tmp; |
} |
|
/* printing 100 using %2d gives "100", not "00" */ |
if (i > spec.precision) |
spec.precision = i; |
/* leading space padding */ |
spec.field_width -= spec.precision; |
if (!(spec.flags & (ZEROPAD+LEFT))) { |
while(--spec.field_width >= 0) { |
if (buf < end) |
*buf = ' '; |
++buf; |
} |
} |
/* sign */ |
if (sign) { |
if (buf < end) |
*buf = sign; |
++buf; |
} |
/* "0x" / "0" prefix */ |
if (need_pfx) { |
if (buf < end) |
*buf = '0'; |
++buf; |
if (spec.base == 16) { |
if (buf < end) |
*buf = ('X' | locase); |
++buf; |
} |
} |
/* zero or space padding */ |
if (!(spec.flags & LEFT)) { |
char c = (spec.flags & ZEROPAD) ? '0' : ' '; |
while (--spec.field_width >= 0) { |
if (buf < end) |
*buf = c; |
++buf; |
} |
} |
/* hmm even more zero padding? */ |
while (i <= --spec.precision) { |
if (buf < end) |
*buf = '0'; |
++buf; |
} |
/* actual digits of result */ |
while (--i >= 0) { |
if (buf < end) |
*buf = tmp[i]; |
++buf; |
} |
/* trailing space padding */ |
while (--spec.field_width >= 0) { |
if (buf < end) |
*buf = ' '; |
++buf; |
} |
return buf; |
} |
|
static char *string(char *buf, char *end, char *s, struct printf_spec spec) |
{ |
int len, i; |
|
if ((unsigned long)s < PAGE_SIZE) |
s = "<NULL>"; |
|
len = strnlen(s, spec.precision); |
|
if (!(spec.flags & LEFT)) { |
while (len < spec.field_width--) { |
if (buf < end) |
*buf = ' '; |
++buf; |
} |
} |
for (i = 0; i < len; ++i) { |
if (buf < end) |
*buf = *s; |
++buf; ++s; |
} |
while (len < spec.field_width--) { |
if (buf < end) |
*buf = ' '; |
++buf; |
} |
return buf; |
} |
|
|
/* |
* Show a '%p' thing. |
*/ |
static char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
struct printf_spec spec) |
{ |
if (!ptr) |
return string(buf, end, "(null)", spec); |
|
spec.flags |= SMALL; |
if (spec.field_width == -1) { |
spec.field_width = 2*sizeof(void *); |
spec.flags |= ZEROPAD; |
} |
spec.base = 16; |
|
return number(buf, end, (unsigned long) ptr, spec); |
} |
|
/* |
* Helper function to decode printf style format. |
* Each call decode a token from the format and return the |
* number of characters read (or likely the delta where it wants |
* to go on the next call). |
* The decoded token is returned through the parameters |
* |
* 'h', 'l', or 'L' for integer fields |
* 'z' support added 23/7/1999 S.H. |
* 'z' changed to 'Z' --davidm 1/25/99 |
* 't' added for ptrdiff_t |
* |
* @fmt: the format string |
* @type of the token returned |
* @flags: various flags such as +, -, # tokens.. |
* @field_width: overwritten width |
* @base: base of the number (octal, hex, ...) |
* @precision: precision of a number |
* @qualifier: qualifier of a number (long, size_t, ...) |
*/ |
static int format_decode(const char *fmt, struct printf_spec *spec) |
{ |
const char *start = fmt; |
|
/* we finished early by reading the field width */ |
if (spec->type == FORMAT_TYPE_WIDTH) { |
if (spec->field_width < 0) { |
spec->field_width = -spec->field_width; |
spec->flags |= LEFT; |
} |
spec->type = FORMAT_TYPE_NONE; |
goto precision; |
} |
|
/* we finished early by reading the precision */ |
if (spec->type == FORMAT_TYPE_PRECISION) { |
if (spec->precision < 0) |
spec->precision = 0; |
|
spec->type = FORMAT_TYPE_NONE; |
goto qualifier; |
} |
|
/* By default */ |
spec->type = FORMAT_TYPE_NONE; |
|
for (; *fmt ; ++fmt) { |
if (*fmt == '%') |
break; |
} |
|
/* Return the current non-format string */ |
if (fmt != start || !*fmt) |
return fmt - start; |
|
/* Process flags */ |
spec->flags = 0; |
|
while (1) { /* this also skips first '%' */ |
int found = 1; |
|
++fmt; |
|
switch (*fmt) { |
case '-': spec->flags |= LEFT; break; |
case '+': spec->flags |= PLUS; break; |
case ' ': spec->flags |= SPACE; break; |
case '#': spec->flags |= SPECIAL; break; |
case '0': spec->flags |= ZEROPAD; break; |
default: found = 0; |
} |
|
if (!found) |
break; |
} |
|
/* get field width */ |
spec->field_width = -1; |
|
if (isdigit(*fmt)) |
spec->field_width = skip_atoi(&fmt); |
else if (*fmt == '*') { |
/* it's the next argument */ |
spec->type = FORMAT_TYPE_WIDTH; |
return ++fmt - start; |
} |
|
precision: |
/* get the precision */ |
spec->precision = -1; |
if (*fmt == '.') { |
++fmt; |
if (isdigit(*fmt)) { |
spec->precision = skip_atoi(&fmt); |
if (spec->precision < 0) |
spec->precision = 0; |
} else if (*fmt == '*') { |
/* it's the next argument */ |
spec->type = FORMAT_TYPE_PRECISION; |
return ++fmt - start; |
} |
} |
|
qualifier: |
/* get the conversion qualifier */ |
spec->qualifier = -1; |
if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || |
*fmt == 'Z' || *fmt == 'z' || *fmt == 't') { |
spec->qualifier = *fmt++; |
if (unlikely(spec->qualifier == *fmt)) { |
if (spec->qualifier == 'l') { |
spec->qualifier = 'L'; |
++fmt; |
} else if (spec->qualifier == 'h') { |
spec->qualifier = 'H'; |
++fmt; |
} |
} |
} |
|
/* default base */ |
spec->base = 10; |
switch (*fmt) { |
case 'c': |
spec->type = FORMAT_TYPE_CHAR; |
return ++fmt - start; |
|
case 's': |
spec->type = FORMAT_TYPE_STR; |
return ++fmt - start; |
|
case 'p': |
spec->type = FORMAT_TYPE_PTR; |
return fmt - start; |
/* skip alnum */ |
|
case 'n': |
spec->type = FORMAT_TYPE_NRCHARS; |
return ++fmt - start; |
|
case '%': |
spec->type = FORMAT_TYPE_PERCENT_CHAR; |
return ++fmt - start; |
|
/* integer number formats - set up the flags and "break" */ |
case 'o': |
spec->base = 8; |
break; |
|
case 'x': |
spec->flags |= SMALL; |
|
case 'X': |
spec->base = 16; |
break; |
|
case 'd': |
case 'i': |
spec->flags |= SIGN; |
case 'u': |
break; |
|
default: |
spec->type = FORMAT_TYPE_INVALID; |
return fmt - start; |
} |
|
if (spec->qualifier == 'L') |
spec->type = FORMAT_TYPE_LONG_LONG; |
else if (spec->qualifier == 'l') { |
if (spec->flags & SIGN) |
spec->type = FORMAT_TYPE_LONG; |
else |
spec->type = FORMAT_TYPE_ULONG; |
} else if (spec->qualifier == 'Z' || spec->qualifier == 'z') { |
spec->type = FORMAT_TYPE_SIZE_T; |
} else if (spec->qualifier == 't') { |
spec->type = FORMAT_TYPE_PTRDIFF; |
} else if (spec->qualifier == 'H') { |
if (spec->flags & SIGN) |
spec->type = FORMAT_TYPE_BYTE; |
else |
spec->type = FORMAT_TYPE_UBYTE; |
} else if (spec->qualifier == 'h') { |
if (spec->flags & SIGN) |
spec->type = FORMAT_TYPE_SHORT; |
else |
spec->type = FORMAT_TYPE_USHORT; |
} else { |
if (spec->flags & SIGN) |
spec->type = FORMAT_TYPE_INT; |
else |
spec->type = FORMAT_TYPE_UINT; |
} |
|
return ++fmt - start; |
} |
|
/** |
* vsnprintf - Format a string and place it in a buffer |
* @buf: The buffer to place the result into |
* @size: The size of the buffer, including the trailing null space |
* @fmt: The format string to use |
* @args: 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', as per ISO C99. If you want to have the exact |
* number of characters written into @buf as return value |
* (not including the trailing '\0'), use vscnprintf(). If the |
* return is greater than or equal to @size, the resulting |
* string is truncated. |
* |
* Call this function if you are already dealing with a va_list. |
* You probably want snprintf() instead. |
*/ |
int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
{ |
unsigned long long num; |
char *str, *end, c; |
int read; |
struct printf_spec spec = {0}; |
|
/* Reject out-of-range values early. Large positive sizes are |
used for unknown buffer sizes. */ |
if (unlikely((int) size < 0)) { |
/* There can be only one.. */ |
static char warn = 1; |
// WARN_ON(warn); |
warn = 0; |
return 0; |
} |
|
str = buf; |
end = buf + size; |
|
/* Make sure end is always >= buf */ |
if (end < buf) { |
end = ((void *)-1); |
size = end - buf; |
} |
|
while (*fmt) { |
const char *old_fmt = fmt; |
|
read = format_decode(fmt, &spec); |
|
fmt += read; |
|
switch (spec.type) { |
case FORMAT_TYPE_NONE: { |
int copy = read; |
if (str < end) { |
if (copy > end - str) |
copy = end - str; |
memcpy(str, old_fmt, copy); |
} |
str += read; |
break; |
} |
|
case FORMAT_TYPE_WIDTH: |
spec.field_width = va_arg(args, int); |
break; |
|
case FORMAT_TYPE_PRECISION: |
spec.precision = va_arg(args, int); |
break; |
|
case FORMAT_TYPE_CHAR: |
if (!(spec.flags & LEFT)) { |
while (--spec.field_width > 0) { |
if (str < end) |
*str = ' '; |
++str; |
|
} |
} |
c = (unsigned char) va_arg(args, int); |
if (str < end) |
*str = c; |
++str; |
while (--spec.field_width > 0) { |
if (str < end) |
*str = ' '; |
++str; |
} |
break; |
|
case FORMAT_TYPE_STR: |
str = string(str, end, va_arg(args, char *), spec); |
break; |
|
case FORMAT_TYPE_PTR: |
str = pointer(fmt+1, str, end, va_arg(args, void *), |
spec); |
while (isalnum(*fmt)) |
fmt++; |
break; |
|
case FORMAT_TYPE_PERCENT_CHAR: |
if (str < end) |
*str = '%'; |
++str; |
break; |
|
case FORMAT_TYPE_INVALID: |
if (str < end) |
*str = '%'; |
++str; |
break; |
|
case FORMAT_TYPE_NRCHARS: { |
int qualifier = spec.qualifier; |
|
if (qualifier == 'l') { |
long *ip = va_arg(args, long *); |
*ip = (str - buf); |
} else if (qualifier == 'Z' || |
qualifier == 'z') { |
size_t *ip = va_arg(args, size_t *); |
*ip = (str - buf); |
} else { |
int *ip = va_arg(args, int *); |
*ip = (str - buf); |
} |
break; |
} |
|
default: |
switch (spec.type) { |
case FORMAT_TYPE_LONG_LONG: |
num = va_arg(args, long long); |
break; |
case FORMAT_TYPE_ULONG: |
num = va_arg(args, unsigned long); |
break; |
case FORMAT_TYPE_LONG: |
num = va_arg(args, long); |
break; |
case FORMAT_TYPE_SIZE_T: |
num = va_arg(args, size_t); |
break; |
// case FORMAT_TYPE_PTRDIFF: |
// num = va_arg(args, ptrdiff_t); |
// break; |
case FORMAT_TYPE_UBYTE: |
num = (unsigned char) va_arg(args, int); |
break; |
case FORMAT_TYPE_BYTE: |
num = (signed char) va_arg(args, int); |
break; |
case FORMAT_TYPE_USHORT: |
num = (unsigned short) va_arg(args, int); |
break; |
case FORMAT_TYPE_SHORT: |
num = (short) va_arg(args, int); |
break; |
case FORMAT_TYPE_INT: |
num = (int) va_arg(args, int); |
break; |
default: |
num = va_arg(args, unsigned int); |
} |
|
str = number(str, end, num, spec); |
} |
} |
|
if (size > 0) { |
if (str < end) |
*str = '\0'; |
else |
end[-1] = '\0'; |
} |
|
/* the trailing null byte doesn't count towards the total */ |
return str-buf; |
|
} |
|
/** |
* snprintf - Format a string and place it in a buffer |
* @buf: The buffer to place the result into |
* @size: The size of the buffer, including the trailing null space |
* @fmt: The format string to use |
* @...: Arguments for the format string |
* |
* The return value is the number of characters which would be |
* generated for the given input, excluding the trailing null, |
* as per ISO C99. If the return is greater than or equal to |
* @size, the resulting string is truncated. |
* |
* See the vsnprintf() documentation for format string extensions over C99. |
*/ |
int snprintf(char * buf, size_t size, const char *fmt, ...) |
{ |
va_list args; |
int i; |
|
va_start(args, fmt); |
i=vsnprintf(buf,size,fmt,args); |
va_end(args); |
return i; |
} |
|
/** |
* scnprintf - Format a string and place it in a buffer |
* @buf: The buffer to place the result into |
* @size: The size of the buffer, including the trailing null space |
* @fmt: The format string to use |
* @...: Arguments for the format string |
* |
* The return value is the number of characters written into @buf not including |
* the trailing '\0'. If @size is <= 0 the function returns 0. |
*/ |
|
int scnprintf(char * buf, size_t size, const char *fmt, ...) |
{ |
va_list args; |
int i; |
|
va_start(args, fmt); |
i = vsnprintf(buf, size, fmt, args); |
va_end(args); |
return (i >= size) ? (size - 1) : i; |
} |
|
/** |
* vsprintf - Format a string and place it in a buffer |
* @buf: The buffer to place the result into |
* @fmt: The format string to use |
* @args: Arguments for the format string |
* |
* The function returns the number of characters written |
* into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
* buffer overflows. |
* |
* Call this function if you are already dealing with a va_list. |
* You probably want sprintf() instead. |
* |
* See the vsnprintf() documentation for format string extensions over C99. |
*/ |
int vsprintf(char *buf, const char *fmt, va_list args) |
{ |
return vsnprintf(buf, __INT_MAX__, fmt, args); |
} |
|
/** |
* sprintf - Format a string and place it in a buffer |
* @buf: The buffer to place the result into |
* @fmt: The format string to use |
* @...: Arguments for the format string |
* |
* The function returns the number of characters written |
* into @buf. Use snprintf() or scnprintf() in order to avoid |
* buffer overflows. |
* |
* See the vsnprintf() documentation for format string extensions over C99. |
*/ |
int sprintf(char * buf, const char *fmt, ...) |
{ |
va_list args; |
int i; |
|
va_start(args, fmt); |
i=vsnprintf(buf, __INT_MAX__, fmt, args); |
va_end(args); |
return i; |
} |
|
static inline |
void api_putc(char c) |
{ |
if (c == '\n') api_putc('\r'); |
|
__asm__ __volatile__( |
"int $0x40" |
::"a"(63),"b"(1),"c"(c)); |
} |
|
int API print(const char *fmt,...) |
{ |
char buf[256]; |
va_list args; |
int retval; |
int i; |
|
va_start(args, fmt); |
i = vsnprintf(buf, 256, fmt, args); |
va_end(args); |
|
retval = (i >= 256) ? (256 - 1) : i; |
|
for(i = 0; i< retval; i++) |
api_putc(buf[i]); |
|
return retval; |
}; |
|
|
|
#if 0 |
/** |
* vsscanf - Unformat a buffer into a list of arguments |
* @buf: input buffer |
* @fmt: format of buffer |
* @args: arguments |
*/ |
int vsscanf(const char * buf, const char * fmt, va_list args) |
{ |
const char *str = buf; |
char *next; |
char digit; |
int num = 0; |
int qualifier; |
int base; |
int field_width; |
int is_sign = 0; |
|
while(*fmt && *str) { |
/* skip any white space in format */ |
/* white space in format matchs any amount of |
* white space, including none, in the input. |
*/ |
if (isspace(*fmt)) { |
while (isspace(*fmt)) |
++fmt; |
while (isspace(*str)) |
++str; |
} |
|
/* anything that is not a conversion must match exactly */ |
if (*fmt != '%' && *fmt) { |
if (*fmt++ != *str++) |
break; |
continue; |
} |
|
if (!*fmt) |
break; |
++fmt; |
|
/* skip this conversion. |
* advance both strings to next white space |
*/ |
if (*fmt == '*') { |
while (!isspace(*fmt) && *fmt) |
fmt++; |
while (!isspace(*str) && *str) |
str++; |
continue; |
} |
|
/* get field width */ |
field_width = -1; |
if (isdigit(*fmt)) |
field_width = skip_atoi(&fmt); |
|
/* get conversion qualifier */ |
qualifier = -1; |
if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || |
*fmt == 'Z' || *fmt == 'z') { |
qualifier = *fmt++; |
if (unlikely(qualifier == *fmt)) { |
if (qualifier == 'h') { |
qualifier = 'H'; |
fmt++; |
} else if (qualifier == 'l') { |
qualifier = 'L'; |
fmt++; |
} |
} |
} |
base = 10; |
is_sign = 0; |
|
if (!*fmt || !*str) |
break; |
|
switch(*fmt++) { |
case 'c': |
{ |
char *s = (char *) va_arg(args,char*); |
if (field_width == -1) |
field_width = 1; |
do { |
*s++ = *str++; |
} while (--field_width > 0 && *str); |
num++; |
} |
continue; |
case 's': |
{ |
char *s = (char *) va_arg(args, char *); |
if(field_width == -1) |
field_width = INT_MAX; |
/* first, skip leading white space in buffer */ |
while (isspace(*str)) |
str++; |
|
/* now copy until next white space */ |
while (*str && !isspace(*str) && field_width--) { |
*s++ = *str++; |
} |
*s = '\0'; |
num++; |
} |
continue; |
case 'n': |
/* return number of characters read so far */ |
{ |
int *i = (int *)va_arg(args,int*); |
*i = str - buf; |
} |
continue; |
case 'o': |
base = 8; |
break; |
case 'x': |
case 'X': |
base = 16; |
break; |
case 'i': |
base = 0; |
case 'd': |
is_sign = 1; |
case 'u': |
break; |
case '%': |
/* looking for '%' in str */ |
if (*str++ != '%') |
return num; |
continue; |
default: |
/* invalid format; stop here */ |
return num; |
} |
|
/* have some sort of integer conversion. |
* first, skip white space in buffer. |
*/ |
while (isspace(*str)) |
str++; |
|
digit = *str; |
if (is_sign && digit == '-') |
digit = *(str + 1); |
|
if (!digit |
|| (base == 16 && !isxdigit(digit)) |
|| (base == 10 && !isdigit(digit)) |
|| (base == 8 && (!isdigit(digit) || digit > '7')) |
|| (base == 0 && !isdigit(digit))) |
break; |
|
switch(qualifier) { |
case 'H': /* that's 'hh' in format */ |
if (is_sign) { |
signed char *s = (signed char *) va_arg(args,signed char *); |
*s = (signed char) simple_strtol(str,&next,base); |
} else { |
unsigned char *s = (unsigned char *) va_arg(args, unsigned char *); |
*s = (unsigned char) simple_strtoul(str, &next, base); |
} |
break; |
case 'h': |
if (is_sign) { |
short *s = (short *) va_arg(args,short *); |
*s = (short) simple_strtol(str,&next,base); |
} else { |
unsigned short *s = (unsigned short *) va_arg(args, unsigned short *); |
*s = (unsigned short) simple_strtoul(str, &next, base); |
} |
break; |
case 'l': |
if (is_sign) { |
long *l = (long *) va_arg(args,long *); |
*l = simple_strtol(str,&next,base); |
} else { |
unsigned long *l = (unsigned long*) va_arg(args,unsigned long*); |
*l = simple_strtoul(str,&next,base); |
} |
break; |
case 'L': |
if (is_sign) { |
long long *l = (long long*) va_arg(args,long long *); |
*l = simple_strtoll(str,&next,base); |
} else { |
unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*); |
*l = simple_strtoull(str,&next,base); |
} |
break; |
case 'Z': |
case 'z': |
{ |
size_t *s = (size_t*) va_arg(args,size_t*); |
*s = (size_t) simple_strtoul(str,&next,base); |
} |
break; |
default: |
if (is_sign) { |
int *i = (int *) va_arg(args, int*); |
*i = (int) simple_strtol(str,&next,base); |
} else { |
unsigned int *i = (unsigned int*) va_arg(args, unsigned int*); |
*i = (unsigned int) simple_strtoul(str,&next,base); |
} |
break; |
} |
num++; |
|
if (!next) |
break; |
str = next; |
} |
|
/* |
* Now we've come all the way through so either the input string or the |
* format ended. In the former case, there can be a %n at the current |
* position in the format that needs to be filled. |
*/ |
if (*fmt == '%' && *(fmt + 1) == 'n') { |
int *p = (int *)va_arg(args, int *); |
*p = str - buf; |
} |
|
return num; |
} |
#endif |
|