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- /*
- * vsprintf.c
- *
- * Copyright (C) 1991-1996 Linus Torvalds
- */
- /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
- /*
- * Wirzenius wrote this portably, Torvalds fucked it up :-)
- */
- #include <stdarg.h>
- #include "string.h"
- #include "hash.h"
- #include <linux/unistd.h>
- #include "syscall.h"
- /* we use this so that we can do without the ctype library */
- #define is_digit(c) ((c) >= '0' && (c) <= '9')
- static int skip_atoi(const char **s)
- {
- int i=0;
- while (is_digit(**s))
- i = i*10 + *((*s)++) - '0';
- 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' */
- #ifndef __sparc__
- #define do_div(n,base) ({ \
- int __res; \
- __res = ((unsigned long) n) % (unsigned) base; \
- n = ((unsigned long) n) / (unsigned) base; \
- __res; })
- #else
- #define do_div(n,base) _dl_div ((n)/(base))
- #define do_div(n,base) ({ \
- int __res; \
- __res = _dl_urem(((unsigned long) n),(unsigned) base); \
- n = _dl_udiv(((unsigned long) n),(unsigned) base); \
- __res; })
- #endif
- #define ADD_CHAR(s,n,c) ( ((n) > 1) ? *(s)++ = (c), (n)-- : (c) )
- static char * number(char * str, int *bufsize, long num, int base, int size, int precision
- ,int type)
- {
- char c,sign,tmp[66];
- const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
- int i;
- if (type & LARGE)
- digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
- if (type & LEFT)
- type &= ~ZEROPAD;
- if (base < 2 || base > 36)
- return 0;
- c = (type & ZEROPAD) ? '0' : ' ';
- sign = 0;
- if (type & SIGN) {
- if (num < 0) {
- sign = '-';
- num = -num;
- size--;
- } else if (type & PLUS) {
- sign = '+';
- size--;
- } else if (type & SPACE) {
- sign = ' ';
- size--;
- }
- }
- if (type & SPECIAL) {
- if (base == 16)
- size -= 2;
- else if (base == 8)
- size--;
- }
- i = 0;
- if (num == 0)
- tmp[i++]='0';
- else while (num != 0)
- tmp[i++] = digits[do_div(num,base)];
- if (i > precision)
- precision = i;
- size -= precision;
- if (!(type&(ZEROPAD+LEFT)))
- while(size-->0)
- ADD_CHAR(str, *bufsize, ' ');
- if (sign)
- ADD_CHAR(str, *bufsize, sign);
- if (type & SPECIAL) {
- if (base==8)
- ADD_CHAR(str, *bufsize, '0');
- else if (base==16) {
- ADD_CHAR(str, *bufsize, '0');
- ADD_CHAR(str, *bufsize, digits[33]);
- }
- }
- if (!(type & LEFT))
- while (size-- > 0)
- ADD_CHAR(str, *bufsize, c);
- while (i < precision--)
- ADD_CHAR(str, *bufsize, '0');
- while (i-- > 0)
- ADD_CHAR(str, *bufsize, tmp[i]);
- while (size-- > 0)
- ADD_CHAR(str, *bufsize, ' ');
- return str;
- }
- int _dl_fdprintf(int fd, const char *fmt, ...)
- {
- int len;
- unsigned 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 */
- int bufsize;
- char buf[2048];
- va_list(args);
- va_start(args, fmt);
- for (str=buf, bufsize=sizeof buf ; *fmt ; ++fmt) {
- if (*fmt != '%') {
- ADD_CHAR(str, bufsize, *fmt);
- continue;
- }
-
- /* process flags */
- flags = 0;
- repeat:
- ++fmt; /* this also skips first '%' */
- switch (*fmt) {
- case '-': flags |= LEFT; goto repeat;
- case '+': flags |= PLUS; goto repeat;
- case ' ': flags |= SPACE; goto repeat;
- case '#': flags |= SPECIAL; goto repeat;
- case '0': flags |= ZEROPAD; goto repeat;
- }
-
- /* get field width */
- field_width = -1;
- if (is_digit(*fmt))
- field_width = skip_atoi(&fmt);
- else if (*fmt == '*') {
- ++fmt;
- /* it's the next argument */
- field_width = va_arg(args, int);
- if (field_width < 0) {
- field_width = -field_width;
- flags |= LEFT;
- }
- }
- /* get the precision */
- precision = -1;
- if (*fmt == '.') {
- ++fmt;
- if (is_digit(*fmt))
- precision = skip_atoi(&fmt);
- else if (*fmt == '*') {
- ++fmt;
- /* it's the next argument */
- precision = va_arg(args, int);
- }
- if (precision < 0)
- precision = 0;
- }
- /* get the conversion qualifier */
- qualifier = -1;
- if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
- qualifier = *fmt;
- ++fmt;
- }
- /* default base */
- base = 10;
- switch (*fmt) {
- case 'c':
- if (!(flags & LEFT))
- while (--field_width > 0)
- ADD_CHAR(str, bufsize, ' ');
- ADD_CHAR(str, bufsize, (unsigned char) va_arg(args, int));
- while (--field_width > 0)
- ADD_CHAR(str, bufsize, ' ');
- continue;
- case 's':
- s = va_arg(args, char *);
- if (!s)
- s = "<NULL>";
- len = _dl_strlen(s);
- if (!(flags & LEFT))
- while (len < field_width--)
- ADD_CHAR(str, bufsize, ' ');
- for (i = 0; i < len; ++i)
- ADD_CHAR(str, bufsize, *s++);
- while (len < field_width--)
- ADD_CHAR(str, bufsize, ' ');
- continue;
- case 'p':
- if (field_width == -1) {
- field_width = 2*sizeof(void *);
- flags |= ZEROPAD;
- }
- str = number(str, &bufsize,
- (unsigned long) va_arg(args, void *), 16,
- field_width, precision, flags);
- continue;
- case 'n':
- if (qualifier == 'l') {
- long * ip = va_arg(args, long *);
- *ip = (str - buf);
- } else {
- int * ip = va_arg(args, int *);
- *ip = (str - buf);
- }
- continue;
- /* integer number formats - set up the flags and "break" */
- case 'o':
- base = 8;
- break;
- case 'X':
- flags |= LARGE;
- case 'x':
- base = 16;
- break;
- case 'd':
- case 'i':
- flags |= SIGN;
- case 'u':
- break;
- default:
- if (*fmt != '%')
- ADD_CHAR(str, bufsize, '%');
- if (*fmt)
- ADD_CHAR(str, bufsize, *fmt);
- else
- --fmt;
- continue;
- }
- if (qualifier == 'l')
- num = va_arg(args, unsigned long);
- else if (qualifier == 'h')
- if (flags & SIGN)
- num = va_arg(args, short);
- else
- num = va_arg(args, unsigned short);
- else if (flags & SIGN)
- num = va_arg(args, int);
- else
- num = va_arg(args, unsigned int);
- str = number(str, &bufsize, num, base, field_width, precision, flags);
- }
- *str = '\0';
- _dl_write(fd, buf, str-buf);
- return str-buf;
- }
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