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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=8 sts=2 sw=2 fenc=utf-8 :vi│
╚══════════════════════════════════════════════════════════════════════════════╝
│ @author (c) Marco Paland (info@paland.com) │
│ 2014-2019, PALANDesign Hannover, Germany │
│ │
│ @license The MIT License (MIT) │
│ │
│ Permission is hereby granted, free of charge, to any person obtaining a copy │
│ of this software and associated documentation files (the "Software"), to deal│
│ in the Software without restriction, including without limitation the rights │
│ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell │
│ copies of the Software, and to permit persons to whom the Software is │
│ furnished to do so, subject to the following conditions: │
│ │
│ The above copyright notice and this permission notice shall be included in │
│ all copies or substantial portions of the Software. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR │
│ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, │
│ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE │
│ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER │
│ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,│
│ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN │
│ THE SOFTWARE. │
│ │
│ @brief Tiny printf, sprintf and (v)snprintf implementation, optimized for │
│ embedded systems with a very limited resources. These routines are │
│ thread safe and reentrant! Use this instead of the bloated │
│ standard/newlib printf cause these use malloc for printf (and may not │
│ be thread safe). │
│ │
│ @brief Modified by Justine Tunney to support three different types of │
│ UNICODE, 128-bit arithmetic, binary conversion, string escaping, │
│ AVX2 character scanning, and possibly a tinier footprint too, so │
│ long as extremely wild linker hacks aren't considered cheating. │
└─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/bits/bits.h"
#include "libc/bits/weaken.h"
#include "libc/fmt/conv.h"
#include "libc/fmt/fmt.h"
#include "libc/fmt/paland.inc"
#include "libc/fmt/palandprintf.internal.h"
#include "libc/mem/mem.h"
#include "libc/runtime/internal.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
static int ppatoi(const char **str) {
int i;
for (i = 0; '0' <= **str && **str <= '9'; ++*str) {
i *= 10;
i += **str - '0';
}
return i;
}
/**
* Implements {,v}{,s{,n},{,{,x}as},f,d}printf domain-specific language.
*
* Type Specifiers
*
* - `%s` char * (thompson-pike unicode)
* - `%ls` wchar_t * (32-bit unicode → thompson-pike unicode)
* - `%hs` char16_t * (16-bit unicode → thompson-pike unicode)
* - `%b` int (radix 2 binary)
* - `%o` int (radix 8 octal)
* - `%d` int (radix 10 decimal)
* - `%x` int (radix 16 hexadecimal)
* - `%X` int (radix 16 hexadecimal uppercase)
* - `%u` unsigned
* - `%f` double
* - `%Lf` long double
* - `%p` pointer (48-bit hexadecimal)
*
* Size Modifiers
*
* - `%hhd` char (8-bit)
* - `%hd` short (16-bit)
* - `%ld` long (64-bit)
* - `%lu` unsigned long (64-bit)
* - `%lx` unsigned long (64-bit hexadecimal)
* - `%jd` intmax_t (128-bit)
*
* Width Modifiers
*
* - `%08d` fixed columns w/ zero leftpadding
* - `%8d` fixed columns w/ space leftpadding
* - `%*s` variable column string (thompson-pike)
*
* Precision Modifiers
*
* - `%.8s` supplied byte length (obeys nul terminator)
* - `%.*s` supplied byte length argument (obeys nul terminator)
* - ``%`.*s`` supplied byte length argument c escaped (ignores nul term)
* - `%#.*s` supplied byte length argument visualized (ignores nul term)
* - `%.*hs` supplied char16_t length argument (obeys nul terminator)
* - `%.*ls` supplied wchar_t length argument (obeys nul terminator)
*
* Formatting Modifiers
*
* - `%,d` thousands separators
* - `%'s` escaped c string literal
* - ``%`c`` c escaped character
* - ``%`'c`` c escaped character quoted
* - ``%`s`` c escaped string
* - ``%`'s`` c escaped string quoted
* - ``%`s`` escaped double quoted c string literal
* - ``%`c`` escaped double quoted c character literal
* - `%+d` plus leftpad if positive (aligns w/ negatives)
* - `% d` space leftpad if positive (aligns w/ negatives)
* - `%#s` datum (radix 256 null-terminated ibm cp437)
* - `%#x` int (radix 16 hexadecimal w/ 0x prefix if not zero)
*
* @note implementation detail of printf(), snprintf(), etc.
* @see printf() for wordier documentation
*/
hidden int palandprintf(void *fn, void *arg, const char *format, va_list va) {
void *p;
char qchar;
long double ldbl;
wchar_t charbuf[1];
const char *alphabet;
int (*out)(long, void *);
unsigned char signbit, log2base;
int w, flags, width, lasterr, precision;
lasterr = errno;
out = fn ? fn : (int (*)(int, void *))missingno;
while (*format) {
/* %[flags][width][.precision][length] */
if (*format != '%') {
/* no */
if (out(*format, arg) == -1) return -1;
format++;
continue;
} else {
/* yes, evaluate it */
format++;
}
/* evaluate flags */
flags = 0;
getflag:
switch (*format++) {
case '0':
flags |= FLAGS_ZEROPAD;
goto getflag;
case '-':
flags |= FLAGS_LEFT;
goto getflag;
case '+':
flags |= FLAGS_PLUS;
goto getflag;
case ' ':
flags |= FLAGS_SPACE;
goto getflag;
case '#':
flags |= FLAGS_HASH;
goto getflag;
case ',':
flags |= FLAGS_GROUPING;
goto getflag;
case '`':
flags |= FLAGS_REPR;
/* fallthrough */
case '\'':
flags |= FLAGS_QUOTE;
goto getflag;
default:
format--;
break;
}
/* evaluate width field */
width = 0;
if (isdigit(*format)) {
width = ppatoi(&format);
} else if (*format == '*') {
w = va_arg(va, int);
if (w < 0) {
flags |= FLAGS_LEFT; /* reverse padding */
width = -w;
} else {
width = w;
}
format++;
}
/* evaluate precision field */
precision = 0;
if (*format == '.') {
flags |= FLAGS_PRECISION;
format++;
if (isdigit(*format)) {
precision = ppatoi(&format);
} else if (*format == '*') {
precision = va_arg(va, int);
format++;
}
}
if (precision < 0) {
precision = 0;
}
/* evaluate length field */
signbit = 31;
switch (*format) {
case 'j': /* intmax_t */
format++;
signbit = sizeof(intmax_t) * 8 - 1;
break;
case 'l':
if (format[1] == 'l') format++;
/* fallthrough */
case 't': /* ptrdiff_t */
case 'z': /* size_t */
case 'Z': /* size_t */
case 'L': /* long double */
format++;
signbit = 63;
break;
case 'h':
format++;
if (*format == 'h') {
format++;
signbit = 7;
} else {
signbit = 15;
}
break;
default:
break;
}
/* evaluate specifier */
alphabet = "0123456789abcdef";
log2base = 0;
qchar = '"';
switch (*format++) {
case 'p':
flags |= FLAGS_ZEROPAD;
width = POINTER_XDIGITS;
log2base = 4;
signbit = 47;
goto DoNumber;
case 'X':
alphabet = "0123456789ABCDEF";
/* fallthrough */
case 'x':
log2base = 4;
goto DoNumber;
case 'b':
log2base = 1;
goto DoNumber;
case 'o':
log2base = 3;
goto DoNumber;
case 'd':
case 'i':
flags |= FLAGS_ISSIGNED;
/* fallthrough */
case 'u': {
flags &= ~FLAGS_HASH; /* no hash for dec format */
DoNumber:
if (!weaken(ntoa) ||
weaken(ntoa)(out, arg, va, signbit, log2base, precision, width,
flags, alphabet) == -1) {
return -1;
}
break;
}
case 'f':
case 'F':
if (signbit == 63) {
ldbl = va_arg(va, long double);
} else {
ldbl = va_arg(va, double);
}
if (!weaken(ftoa) ||
weaken(ftoa)(out, arg, ldbl, precision, width, flags) == -1) {
return -1;
}
break;
case 'c':
precision = 1;
flags |= FLAGS_PRECISION;
qchar = '\'';
p = charbuf;
charbuf[0] = va_arg(va, int); /* assume little endian */
goto showstr;
case 'm':
p = weaken(strerror) ? weaken(strerror)(lasterr) : "?";
signbit = 0;
goto showstr;
case 'r':
flags |= FLAGS_REPR;
/* fallthrough */
case 'q':
flags |= FLAGS_QUOTE;
/* fallthrough */
case 's':
p = va_arg(va, void *);
showstr:
if (!weaken(stoa) || weaken(stoa)(out, arg, p, flags, precision, width,
signbit, qchar) == -1) {
return -1;
}
break;
case '%':
if (out('%', arg) == -1) return -1;
break;
default:
if (out(format[-1], arg) == -1) return -1;
break;
}
}
return 0;
}