| /* |
| * 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 <string.h> |
| |
| /* haha, don't need ctype.c */ |
| #define isdigit(c) ((c) >= '0' && (c) <= '9') |
| #define is_digit isdigit |
| #define isxdigit(c) (((c) >= '0' && (c) <= '9') || ((c) >= 'a' && (c) <= 'f') || ((c) >= 'A' && (c) <= 'F')) |
| #define islower(c) ((c) >= 'a' && (c) <= 'z') |
| #define toupper(c) __toupper(c) |
| |
| static inline unsigned char __toupper(unsigned char c) |
| { |
| if (islower(c)) |
| c -= 'a'-'A'; |
| return c; |
| } |
| |
| |
| unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base) |
| { |
| unsigned long result = 0,value; |
| |
| if (!base) { |
| base = 10; |
| if (*cp == '0') { |
| base = 8; |
| cp++; |
| if ((*cp == 'x') && isxdigit(cp[1])) { |
| cp++; |
| base = 16; |
| } |
| } |
| } |
| while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp) |
| ? toupper(*cp) : *cp)-'A'+10) < base) { |
| result = result*base + value; |
| cp++; |
| } |
| if (endp) |
| *endp = (char *)cp; |
| return result; |
| } |
| |
| 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); |
| } |
| |
| |
| 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' */ |
| |
| #define do_div(n,base) ({ \ |
| int __res; \ |
| __res = ((unsigned long) n) % (unsigned) base; \ |
| n = ((unsigned long) n) / (unsigned) base; \ |
| __res; }) |
| |
| static int number(void (*tx_byte)(unsigned char byte), long num, int base, int size, int precision |
| ,int type) |
| { |
| char c,sign,tmp[66]; |
| const char *digits="0123456789abcdefghijklmnopqrstuvwxyz"; |
| int i; |
| int count = 0; |
| |
| 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) |
| tx_byte(' '), count++; |
| if (sign) |
| tx_byte(sign), count++; |
| if (type & SPECIAL) { |
| if (base==8) |
| tx_byte('0'), count++; |
| else if (base==16) { |
| tx_byte('0'), count++; |
| tx_byte(digits[33]), count++; |
| } |
| } |
| if (!(type & LEFT)) |
| while (size-- > 0) |
| tx_byte(c), count++; |
| while (i < precision--) |
| tx_byte('0'), count++; |
| while (i-- > 0) |
| tx_byte(tmp[i]), count++; |
| while (size-- > 0) |
| tx_byte(' '), count++; |
| return count; |
| } |
| |
| |
| int vtxprintf(void (*tx_byte)(unsigned char byte), const char *fmt, va_list args) |
| { |
| int len; |
| unsigned long num; |
| int i, base; |
| 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 count; |
| |
| for (count=0; *fmt ; ++fmt) { |
| if (*fmt != '%') { |
| tx_byte(*fmt), count++; |
| 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) |
| tx_byte(' '), count++; |
| tx_byte((unsigned char) va_arg(args, int)), count++; |
| while (--field_width > 0) |
| tx_byte(' '), count++; |
| continue; |
| |
| case 's': |
| s = va_arg(args, char *); |
| if (!s) |
| s = "<NULL>"; |
| |
| len = strnlen(s, precision); |
| |
| if (!(flags & LEFT)) |
| while (len < field_width--) |
| tx_byte(' '), count++; |
| for (i = 0; i < len; ++i) |
| tx_byte(*s++), count++; |
| while (len < field_width--) |
| tx_byte(' '), count++; |
| continue; |
| |
| case 'p': |
| if (field_width == -1) { |
| field_width = 2*sizeof(void *); |
| flags |= ZEROPAD; |
| } |
| count += number(tx_byte, |
| (unsigned long) va_arg(args, void *), 16, |
| field_width, precision, flags); |
| continue; |
| |
| |
| case 'n': |
| if (qualifier == 'l') { |
| long * ip = va_arg(args, long *); |
| *ip = count; |
| } else { |
| int * ip = va_arg(args, int *); |
| *ip = count; |
| } |
| continue; |
| |
| case '%': |
| tx_byte('%'), count++; |
| 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: |
| tx_byte('%'), count++; |
| if (*fmt) |
| tx_byte(*fmt), count++; |
| else |
| --fmt; |
| continue; |
| } |
| if (qualifier == 'l') |
| num = va_arg(args, unsigned long); |
| else if (qualifier == 'h') { |
| num = (unsigned short) va_arg(args, int); |
| if (flags & SIGN) |
| num = (short) num; |
| } else if (flags & SIGN) |
| num = va_arg(args, int); |
| else |
| num = va_arg(args, unsigned int); |
| count += number(tx_byte, num, base, field_width, precision, flags); |
| } |
| return count; |
| } |
| |
| /* FIXME this global makes vsprintf non-reentrant |
| */ |
| static char *str_buf; |
| static void str_tx_byte(unsigned char byte) |
| { |
| *str_buf = byte; |
| str_buf++; |
| } |
| |
| int vsprintf(char * buf, const char *fmt, va_list args) |
| { |
| int i; |
| str_buf = buf; |
| i = vtxprintf(str_tx_byte, fmt, args); |
| /* maeder/Ispiri -- The null termination was missing a deference */ |
| /* and was just zeroing out the pointer instead */ |
| *str_buf = '\0'; |
| return i; |
| } |
| |
| int sprintf(char * buf, const char *fmt, ...) |
| { |
| va_list args; |
| int i; |
| |
| va_start(args, fmt); |
| i=vsprintf(buf,fmt,args); |
| va_end(args); |
| return i; |
| } |