/*
* linux/lib/vsprintf.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
/*
* Wirzenius wrote this portably, Torvalds fucked it up :-)
*/
#include <stdarg.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <asm/div64.h>
19 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
{
unsigned long result = 0,value;
23 if (!base) {
base = 10;
25 if (*cp == '0') {
base = 8;
cp++;
28 if ((*cp == 'x') && isxdigit(cp[1])) {
cp++;
base = 16;
}
}
}
while (isxdigit(*cp) &&
35 (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
result = result*base + value;
cp++;
}
39 if (endp)
*endp = (char *)cp;
41 return result;
}
44 long simple_strtol(const char *cp,char **endp,unsigned int base)
{
46 if(*cp=='-')
47 return -simple_strtoul(cp+1,endp,base);
48 return simple_strtoul(cp,endp,base);
}
51 unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base)
{
unsigned long long result = 0,value;
55 if (!base) {
base = 10;
57 if (*cp == '0') {
base = 8;
cp++;
60 if ((*cp == 'x') && isxdigit(cp[1])) {
cp++;
base = 16;
}
}
}
while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
67 ? toupper(*cp) : *cp)-'A'+10) < base) {
result = result*base + value;
cp++;
}
71 if (endp)
*endp = (char *)cp;
73 return result;
}
76 long long simple_strtoll(const char *cp,char **endp,unsigned int base)
{
78 if(*cp=='-')
79 return -simple_strtoull(cp+1,endp,base);
80 return simple_strtoull(cp,endp,base);
}
83 static int skip_atoi(const char **s)
{
int i=0;
87 while (isdigit(**s))
i = i*10 + *((*s)++) - '0';
89 return i;
}
#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 SPECIAL 32 /* 0x */
#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
100 static char * number(char * str, long long num, int base, int size, int precision, int type)
{
char c,sign,tmp[66];
const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
int i;
106 if (type & LARGE)
digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
108 if (type & LEFT)
type &= ~ZEROPAD;
110 if (base < 2 || base > 36)
111 return 0;
c = (type & ZEROPAD) ? '0' : ' ';
sign = 0;
114 if (type & SIGN) {
115 if (num < 0) {
sign = '-';
num = -num;
size--;
119 } else if (type & PLUS) {
sign = '+';
size--;
122 } else if (type & SPACE) {
sign = ' ';
size--;
}
}
127 if (type & SPECIAL) {
128 if (base == 16)
size -= 2;
130 else if (base == 8)
size--;
}
i = 0;
134 if (num == 0)
tmp[i++]='0';
136 else while (num != 0)
tmp[i++] = digits[do_div(num,base)];
138 if (i > precision)
precision = i;
size -= precision;
141 if (!(type&(ZEROPAD+LEFT)))
142 while(size-->0)
*str++ = ' ';
144 if (sign)
*str++ = sign;
146 if (type & SPECIAL) {
147 if (base==8)
*str++ = '0';
149 else if (base==16) {
*str++ = '0';
*str++ = digits[33];
}
}
154 if (!(type & LEFT))
155 while (size-- > 0)
*str++ = c;
157 while (i < precision--)
*str++ = '0';
159 while (i-- > 0)
*str++ = tmp[i];
161 while (size-- > 0)
*str++ = ' ';
163 return str;
}
/* Forward decl. needed for IP address printing stuff... */
int sprintf(char * buf, const char *fmt, ...);
169 int vsprintf(char *buf, const char *fmt, va_list args)
{
int len;
unsigned long long num;
int i, base;
char * str;
const char *s;
int flags; /* flags to number() */
int field_width; /* width of output field */
int precision; /* min. # of digits for integers; max
number of chars for from string */
int qualifier; /* 'h', 'l', or 'L' for integer fields */
/* 'z' support added 23/7/1999 S.H. */
/* 'z' changed to 'Z' --davidm 1/25/99 */
187 for (str=buf ; *fmt ; ++fmt) {
188 if (*fmt != '%') {
*str++ = *fmt;
190 continue;
}
/* process flags */
flags = 0;
repeat:
++fmt; /* this also skips first '%' */
197 switch (*fmt) {
198 case '-': flags |= LEFT; goto repeat;
199 case '+': flags |= PLUS; goto repeat;
200 case ' ': flags |= SPACE; goto repeat;
201 case '#': flags |= SPECIAL; goto repeat;
202 case '0': flags |= ZEROPAD; goto repeat;
}
/* get field width */
field_width = -1;
207 if (isdigit(*fmt))
field_width = skip_atoi(&fmt);
209 else if (*fmt == '*') {
++fmt;
/* it's the next argument */
field_width = va_arg(args, int);
213 if (field_width < 0) {
field_width = -field_width;
flags |= LEFT;
}
}
/* get the precision */
precision = -1;
221 if (*fmt == '.') {
++fmt;
223 if (isdigit(*fmt))
precision = skip_atoi(&fmt);
225 else if (*fmt == '*') {
++fmt;
/* it's the next argument */
precision = va_arg(args, int);
}
230 if (precision < 0)
precision = 0;
}
/* get the conversion qualifier */
qualifier = -1;
236 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt =='Z') {
qualifier = *fmt;
++fmt;
}
/* default base */
base = 10;
244 switch (*fmt) {
245 case 'c':
246 if (!(flags & LEFT))
247 while (--field_width > 0)
*str++ = ' ';
*str++ = (unsigned char) va_arg(args, int);
250 while (--field_width > 0)
*str++ = ' ';
252 continue;
254 case 's':
s = va_arg(args, char *);
256 if (!s)
s = "<NULL>";
len = strnlen(s, precision);
261 if (!(flags & LEFT))
262 while (len < field_width--)
*str++ = ' ';
264 for (i = 0; i < len; ++i)
*str++ = *s++;
266 while (len < field_width--)
*str++ = ' ';
268 continue;
270 case 'p':
271 if (field_width == -1) {
field_width = 2*sizeof(void *);
flags |= ZEROPAD;
}
str = number(str,
(unsigned long) va_arg(args, void *), 16,
field_width, precision, flags);
278 continue;
281 case 'n':
282 if (qualifier == 'l') {
long * ip = va_arg(args, long *);
*ip = (str - buf);
285 } else if (qualifier == 'Z') {
size_t * ip = va_arg(args, size_t *);
*ip = (str - buf);
288 } else {
int * ip = va_arg(args, int *);
*ip = (str - buf);
}
292 continue;
294 case '%':
*str++ = '%';
296 continue;
/* integer number formats - set up the flags and "break" */
299 case 'o':
base = 8;
301 break;
303 case 'X':
flags |= LARGE;
305 case 'x':
base = 16;
307 break;
309 case 'd':
310 case 'i':
flags |= SIGN;
312 case 'u':
313 break;
315 default:
*str++ = '%';
317 if (*fmt)
*str++ = *fmt;
319 else
--fmt;
321 continue;
}
323 if (qualifier == 'L')
num = va_arg(args, long long);
325 else if (qualifier == 'l') {
num = va_arg(args, unsigned long);
327 if (flags & SIGN)
num = (signed long) num;
329 } else if (qualifier == 'Z') {
num = va_arg(args, size_t);
331 } else if (qualifier == 'h') {
num = (unsigned short) va_arg(args, int);
333 if (flags & SIGN)
num = (signed short) num;
335 } else {
num = va_arg(args, unsigned int);
337 if (flags & SIGN)
num = (signed int) num;
}
str = number(str, num, base, field_width, precision, flags);
}
*str = '\0';
343 return str-buf;
}
346 int sprintf(char * buf, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i=vsprintf(buf,fmt,args);
va_end(args);
354 return i;
}