4 * Copyright (C) 1991, 1992 Linus Torvalds
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
13 #include <linux/types.h>
14 #include <linux/string.h>
15 #include <linux/ctype.h>
20 extern int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
22 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base){
23 unsigned long result = 0,value;
27 if ((*cp == 'x') && isxdigit(cp[1])) {
38 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
39 ? toupper(*cp) : *cp)-'A'+10) < base) {
40 result = result*base + value;
48 long simple_strtol(const char *cp,char **endp,unsigned int base){
50 return -simple_strtoul(cp+1,endp,base);
51 return simple_strtoul(cp,endp,base);
54 #ifdef CFG_64BIT_STRTOUL
55 unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base)
57 unsigned long long result = 0, value;
61 if ((*cp == 'x') && isxdigit (cp[1])) {
72 while (isxdigit (*cp) && (value = isdigit (*cp)
74 : (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
75 result = result * base + value;
82 #endif /* CFG_64BIT_STRTOUL */
84 /* we use this so that we can do without the ctype library */
85 #define is_digit(c) ((c) >= '0' && (c) <= '9')
87 static int skip_atoi(const char **s){
91 i = i*10 + *((*s)++) - '0';
95 #define ZEROPAD 1 /* pad with zero */
96 #define SIGN 2 /* unsigned/signed long */
97 #define PLUS 4 /* show plus */
98 #define SPACE 8 /* space if plus */
99 #define LEFT 16 /* left justified */
100 #define SPECIAL 32 /* 0x */
101 #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
103 #define do_div(n,base) ({ \
105 __res = ((unsigned long) n) % (unsigned) base; \
106 n = ((unsigned long) n) / (unsigned) base; \
110 #ifdef CFG_64BIT_VSPRINTF
111 static char * number(char * str, long long num, int base, int size, int precision ,int type)
113 static char * number(char * str, long num, int base, int size, int precision ,int type)
117 const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
121 digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
124 if (base < 2 || base > 36)
126 c = (type & ZEROPAD) ? '0' : ' ';
133 } else if (type & PLUS) {
136 } else if (type & SPACE) {
141 if (type & SPECIAL) {
150 else while (num != 0)
151 tmp[i++] = digits[do_div(num,base)];
155 if (!(type&(ZEROPAD+LEFT)))
160 if (type & SPECIAL) {
171 while (i < precision--)
180 /* Forward decl. needed for IP address printing stuff... */
181 int sprintf(char * buf, const char *fmt, ...);
183 int vsprintf(char *buf, const char *fmt, va_list args){
185 #ifdef CFG_64BIT_VSPRINTF
186 unsigned long long num;
194 int flags; /* flags to number() */
196 int field_width; /* width of output field */
197 int precision; /* min. # of digits for integers; max
198 number of chars for from string */
199 int qualifier; /* 'h', 'l', or 'q' for integer fields */
201 for (str=buf ; *fmt ; ++fmt) {
210 ++fmt; /* this also skips first '%' */
212 case '-': flags |= LEFT; goto repeat;
213 case '+': flags |= PLUS; goto repeat;
214 case ' ': flags |= SPACE; goto repeat;
215 case '#': flags |= SPECIAL; goto repeat;
216 case '0': flags |= ZEROPAD; goto repeat;
219 /* get field width */
222 field_width = skip_atoi(&fmt);
223 else if (*fmt == '*') {
225 /* it's the next argument */
226 field_width = va_arg(args, int);
227 if (field_width < 0) {
228 field_width = -field_width;
233 /* get the precision */
238 precision = skip_atoi(&fmt);
239 else if (*fmt == '*') {
241 /* it's the next argument */
242 precision = va_arg(args, int);
248 /* get the conversion qualifier */
250 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'q') {
261 while (--field_width > 0)
263 *str++ = (unsigned char) va_arg(args, int);
264 while (--field_width > 0)
269 s = va_arg(args, char *);
273 len = strnlen(s, precision);
276 while (len < field_width--)
278 for (i = 0; i < len; ++i)
280 while (len < field_width--)
285 if (field_width == -1) {
286 field_width = 2*sizeof(void *);
290 (unsigned long) va_arg(args, void *), 16,
291 field_width, precision, flags);
296 if (qualifier == 'l') {
297 long * ip = va_arg(args, long *);
300 int * ip = va_arg(args, int *);
309 /* integer number formats - set up the flags and "break" */
334 #ifdef CFG_64BIT_VSPRINTF
335 if (qualifier == 'q') /* "quad" for 64 bit variables */
336 num = va_arg(args, unsigned long long);
339 if (qualifier == 'l')
340 num = va_arg(args, unsigned long);
341 else if (qualifier == 'h') {
342 num = (unsigned short) va_arg(args, int);
345 } else if (flags & SIGN)
346 num = va_arg(args, int);
348 num = va_arg(args, unsigned int);
349 str = number(str, num, base, field_width, precision, flags);
355 int sprintf(char * buf, const char *fmt, ...){
360 i=vsprintf(buf,fmt,args);