2 * Oh, it's a waste of space, but oh-so-yummy for debugging. It's just
3 * initialization code anyway, so it doesn't take up space when we're
4 * actually running. This version of printf() does not include 64-bit
5 * support. "Live with it."
7 * Most of this code was shamelessly snarfed from the Linux kernel, then
8 * modified. It's therefore GPL.
10 * printf() isn't actually needed to build syslinux.com, but during
11 * debugging it's handy.
18 static int strnlen(const char *s, int maxlen)
21 while ( *es && maxlen ) {
28 #define ZEROPAD 1 /* pad with zero */
29 #define SIGN 2 /* unsigned/signed long */
30 #define PLUS 4 /* show plus */
31 #define SPACE 8 /* space if plus */
32 #define LEFT 16 /* left justified */
33 #define SPECIAL 32 /* 0x */
34 #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
36 #define do_div(n,base) ({ \
38 __res = ((unsigned long) n) % (unsigned) base; \
39 n = ((unsigned long) n) / (unsigned) base; \
42 static char * number(char * str, long num, int base, int size, int precision
46 const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
50 digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
53 if (base < 2 || base > 36)
55 c = (type & ZEROPAD) ? '0' : ' ';
62 } else if (type & PLUS) {
65 } else if (type & SPACE) {
80 tmp[i++] = digits[do_div(num,base)];
84 if (!(type&(ZEROPAD+LEFT)))
100 while (i < precision--)
109 /* Forward decl. needed for IP address printing stuff... */
110 int sprintf(char * buf, const char *fmt, ...);
112 int vsprintf(char *buf, const char *fmt, va_list args)
120 int flags; /* flags to number() */
122 int field_width; /* width of output field */
123 int precision; /* min. # of digits for integers; max
124 number of chars for from string */
125 int qualifier; /* 'h', 'l', or 'L' for integer fields */
127 for (str=buf ; *fmt ; ++fmt) {
136 ++fmt; /* this also skips first '%' */
138 case '-': flags |= LEFT; goto repeat;
139 case '+': flags |= PLUS; goto repeat;
140 case ' ': flags |= SPACE; goto repeat;
141 case '#': flags |= SPECIAL; goto repeat;
142 case '0': flags |= ZEROPAD; goto repeat;
145 /* get field width */
148 field_width = skip_atou(&fmt);
149 else if (*fmt == '*') {
151 /* it's the next argument */
152 field_width = va_arg(args, int);
153 if (field_width < 0) {
154 field_width = -field_width;
159 /* get the precision */
164 precision = skip_atou(&fmt);
165 else if (*fmt == '*') {
167 /* it's the next argument */
168 precision = va_arg(args, int);
174 /* get the conversion qualifier */
176 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
187 while (--field_width > 0)
189 *str++ = (unsigned char) va_arg(args, int);
190 while (--field_width > 0)
195 s = va_arg(args, char *);
196 len = strnlen(s, precision);
199 while (len < field_width--)
201 for (i = 0; i < len; ++i)
203 while (len < field_width--)
208 if (field_width == -1) {
209 field_width = 2*sizeof(void *);
213 (unsigned long) va_arg(args, void *), 16,
214 field_width, precision, flags);
219 if (qualifier == 'l') {
220 long * ip = va_arg(args, long *);
223 int * ip = va_arg(args, int *);
232 /* integer number formats - set up the flags and "break" */
257 if (qualifier == 'l')
258 num = va_arg(args, unsigned long);
259 else if (qualifier == 'h') {
260 num = (unsigned short) va_arg(args, int);
263 } else if (flags & SIGN)
264 num = va_arg(args, int);
266 num = va_arg(args, unsigned int);
267 str = number(str, num, base, field_width, precision, flags);
273 int sprintf(char * buf, const char *fmt, ...)
279 i=vsprintf(buf,fmt,args);
284 int printf(const char *fmt, ...)
286 char printf_buf[1024];
291 printed = vsprintf(printf_buf, fmt, args);