-// sprintf() and related functions.
-//
-// This software is copyright (c) 2007 Scott Wood <scott@buserror.net>.
-//
-// This software is provided 'as-is', without any express or implied warranty.
-// In no event will the authors or contributors be held liable for any damages
-// arising from the use of this software.
-//
-// Permission is hereby granted to everyone, free of charge, to use, copy,
-// modify, prepare derivative works of, publish, distribute, perform,
-// sublicense, and/or sell copies of the Software, provided that the above
-// copyright notice and disclaimer of warranty be included in all copies or
-// substantial portions of this software.
-
-#include <stdint.h>
-#include <string.h>
-#include <stdarg.h>
-#include <limits.h>
-
-enum {
- alt_form = 0x0001,
- zero_pad = 0x0002,
- neg_field = 0x0004,
- leave_blank = 0x0008,
- always_sign = 0x0010,
- group_thousands = 0x0020, // FIXME -- unimplemented
- long_arg = 0x0040,
- long_long_arg = 0x0080,
- short_arg = 0x0100,
- short_short_arg = 0x0200,
- intmax_arg = 0x0400,
- ptrdiff_arg = 0x0800,
- size_t_arg = 0x1000,
- capital_hex = 0x2000,
- num_signed = 0x4000,
- has_precision = 0x8000,
-};
-
-static void printf_string(char *buf, size_t &opos, size_t limit,
- const char *src, size_t len)
-{
- if (opos < limit) {
- size_t olen = opos + len <= limit ? len : limit - opos;
- memcpy(buf + opos, src, olen);
- }
-
- opos += len;
-}
-
-static void printf_fill(char *buf, size_t &opos, size_t limit,
- char ch, int len)
-{
- if (opos < limit) {
- size_t olen = opos + len <= limit ? len : limit - opos;
- memset(buf + opos, ch, olen);
- }
-
- opos += len;
-}
-
-static void printf_num(char *obuf, size_t &opos, size_t limit,
- int64_t value, long radix, int fieldwidth,
- int precision, int flags)
-{
- char buf[65];
- int pos = 64;
- int letter = (flags & capital_hex) ? 'A' - 10 : 'a' - 10;
- uint64_t uval;
-
- if (flags & num_signed)
- uval = value < 0 ? -value : value;
- else
- uval = value;
-
- // An explicit precision of 0 suppresses all output if the value
- // is zero. Otherwise, the output size is not limited by precision
- // or field width.
-
- if (uval != 0 || !(flags & has_precision) || precision != 0) do {
- int ch = uval % radix;
-
- if (ch < 10)
- buf[pos] = ch + '0';
- else
- buf[pos] = ch + letter;
-
- uval /= radix;
- pos--;
- } while (uval);
-
- int len = 64 - pos;
-
- // length which counts against fieldwidth but not precision
- int extralen = 0;
-
- if (flags & num_signed) {
- if (value < 0) {
- printf_fill(obuf, opos, limit, '-', 1);
- extralen += 1;
- } else if (flags & always_sign) {
- printf_fill(obuf, opos, limit, '+', 1);
- extralen += 1;
- } else if (flags & leave_blank) {
- printf_fill(obuf, opos, limit, ' ', 1);
- extralen += 1;
- }
- }
-
- if ((flags & alt_form) && value != 0) {
- if (radix == 8 && (!(flags & has_precision) || precision <= len)) {
- flags |= has_precision;
- precision = len + 1;
- }
-
- if (radix == 16) {
- printf_string(obuf, opos, limit, "0x", 2);
- extralen += 2;
- }
- }
-
- if ((flags & has_precision) && len < precision) {
- precision -= len;
- len += precision;
- } else {
- precision = 0;
- }
-
- len += extralen;
-
- if (!(flags & neg_field) && len < fieldwidth) {
- char padchar = (flags & zero_pad) ? '0' : ' ';
- printf_fill(obuf, opos, limit, padchar, fieldwidth - len);
- len = fieldwidth;
- }
-
- if (precision != 0) {
- printf_fill(obuf, opos, limit, '0', precision);
- len += precision;
- }
-
- printf_string(obuf, opos, limit, buf + pos + 1, 64 - pos);
-
- if ((flags & neg_field) && len < fieldwidth)
- printf_fill(obuf, opos, limit, ' ', fieldwidth - len);
-}
-
-extern "C" size_t vsnprintf(char *buf, size_t size,
- const char *str, va_list args)
-{
- size_t opos = 0; // position in the output string
- unsigned int flags = 0;
- int radix = 10;
- int state = 0;
- int fieldwidth = 0;
- int precision = 0;
-
- for (size_t pos = 0; str[pos]; pos++) switch (state) {
- case 0:
- if (str[pos] == '%') {
- flags = 0;
- radix = 10;
- state = 1;
- fieldwidth = 0;
- precision = 0;
- break;
- }
-
- if (opos < size)
- buf[opos] = str[pos];
-
- opos++;
- break;
-
- case 1: // A percent has been seen; read in format characters
- switch (str[pos]) {
- case '#':
- flags |= alt_form;
- break;
-
- case '0':
- if (!(flags & has_precision)) {
- flags |= zero_pad;
- break;
- }
-
- // else fall through
-
- case '1' ... '9':
- if (flags & has_precision)
- goto default_case;
-
- do {
- fieldwidth *= 10;
- fieldwidth += str[pos++] - '0';
- } while (str[pos] >= '0' && str[pos] <= '9');
-
- pos--;
- break;
-
- case '*':
- if (fieldwidth || (flags & has_precision))
- goto default_case;
-
- fieldwidth = va_arg(args, int);
- break;
-
- case '.':
- flags |= has_precision;
-
- if (str[pos + 1] == '*') {
- pos++;
- precision = va_arg(args, int);
- } else while (str[pos + 1] >= '0' && str[pos + 1] <= '9') {
- precision *= 10;
- precision += str[++pos] - '0';
- }
-
- break;
-
- case '-':
- flags |= neg_field;
- break;
-
- case ' ':
- flags |= leave_blank;
- break;
-
- case '+':
- flags |= always_sign;
- break;
-
- case '\'':
- flags |= group_thousands;
- break;
-
- case 'l':
- if (flags & long_arg)
- flags |= long_long_arg;
- else
- flags |= long_arg;
-
- break;
-
- case 'h':
- if (flags & long_arg)
- flags |= short_short_arg;
- else
- flags |= short_arg;
-
- break;
-
- case 'j':
- flags |= intmax_arg;
- break;
-
- case 't':
- flags |= ptrdiff_arg;
- break;
-
- // Note that %z and other such "new" format characters are
- // basically useless because some GCC coder actually went out
- // of their way to make the compiler reject C99 format
- // strings in C++ code, with no way of overriding it that I
- // can find (the source code comments suggest the checking is
- // only when using -pedantic, but I wasn't using -pedantic).
- //
- // Thus, we have the choice of either avoiding %z and friends
- // (and possibly needing to insert hackish casts to silence
- // the compiler's warnings if different architectures define
- // types like size_t in different ways), or not using the
- // format warnings at all.
- //
- // To mitigate this, 32-bit architectures should define
- // pointer-sized special types as "long" rather than "int",
- // so that %lx/%ld can always be used with them. Fixed-size
- // 32-bit types should be declared as "int" rather than
- // "long" for the same reason.
-
- case 'z':
- flags |= size_t_arg;
- break;
-
- case 'd':
- case 'i': {
- int64_t arg;
-
- if ((flags & intmax_arg) || (flags & long_long_arg))
- arg = va_arg(args, long long);
- else if (flags & size_t_arg)
- arg = va_arg(args, ssize_t);
- else if (flags & ptrdiff_arg)
- arg = va_arg(args, ptrdiff_t);
- else if (flags & long_arg)
- arg = va_arg(args, long);
- else if (flags & short_short_arg)
- arg = (signed char)va_arg(args, int);
- else if (flags & short_arg)
- arg = (short)va_arg(args, int);
- else
- arg = va_arg(args, int);
-
- flags |= num_signed;
- printf_num(buf, opos, size, arg, 10,
- fieldwidth, precision, flags);
- state = 0;
- break;
- }
-
- case 'X':
- flags |= capital_hex;
- // fall-through
-
- case 'x':
- radix = 18;
- // fall-through
-
- case 'o':
- radix -= 2;
- // fall-through
-
- case 'u': {
- uint64_t arg;
-
- if ((flags & intmax_arg) || (flags & long_long_arg))
- arg = va_arg(args, unsigned long long);
- else if (flags & size_t_arg)
- arg = va_arg(args, size_t);
- else if (flags & ptrdiff_arg)
- arg = va_arg(args, intptr_t);
- else if (flags & long_arg)
- arg = va_arg(args, unsigned long);
- else if (flags & short_short_arg)
- arg = (unsigned char)va_arg(args, unsigned int);
- else if (flags & short_arg)
- arg = (unsigned short)va_arg(args, unsigned int);
- else if (flags & short_short_arg)
- arg = (signed char)va_arg(args, int);
- else if (flags & short_arg)
- arg = (short)va_arg(args, int);
- else
- arg = va_arg(args, unsigned int);
-
- printf_num(buf, opos, size, arg, radix,
- fieldwidth, precision, flags);
- state = 0;
- break;
- }
-
- case 'c':
- if (opos < size)
- buf[opos] = va_arg(args, int);
-
- opos++;
- state = 0;
- break;
-
- case 's': {
- const char *arg = va_arg(args, const char *);
-
- if (!arg)
- arg = "(null)";
-
- size_t len = strlen(arg);
- printf_string(buf, opos, size, arg, len);
- state = 0;
- break;
- }
-
- case 'p': {
- const void *arg = va_arg(args, const void *);
-
- printf_num(buf, opos, size, (unsigned long)arg, 16,
- fieldwidth, precision, flags);
-
- state = 0;
- break;
- }
-
- case 'n': {
- if ((flags & intmax_arg) || (flags & long_long_arg))
- *va_arg(args, unsigned long long *) = opos;
- else if (flags & size_t_arg)
- *va_arg(args, ssize_t *) = opos;
- else if (flags & ptrdiff_arg)
- *va_arg(args, ptrdiff_t *) = opos;
- else if (flags & long_arg)
- *va_arg(args, long *) = opos;
- else if (flags & short_short_arg)
- *va_arg(args, signed char *) = opos;
- else if (flags & short_arg)
- *va_arg(args, short *) = opos;
- else
- *va_arg(args, int *) = opos;
-
- state = 0;
- break;
- }
-
- default_case: // label for goto
- default:
- if (opos < size)
- buf[opos] = str[pos];
-
- opos++;
- state = 0;
- break;
- }
- }
-
- if (size > 0 && opos >= size)
- buf[size - 1] = 0;
-
- return opos;
-}
-
-extern "C" size_t snprintf(char *buf, size_t size, const char *str, ...)
-{
- va_list args;
- va_start(args, str);
- int ret = vsnprintf(buf, size, str, args);
- va_end(args);
- return ret;
-}
-
-extern "C" size_t sprintf(char *buf, const char *str, ...)
-{
- va_list args;
- va_start(args, str);
- int ret = vsnprintf(buf, ULONG_MAX, str, args);
- va_end(args);
- return ret;
-}
projects / polintos / scott / priv.git / commitdiff