cosmopolitan/libc/fmt/palandprintf.c

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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"
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#include "libc/fmt/fmt.h"
#include "libc/fmt/paland.inc"
#include "libc/fmt/palandprintf.internal.h"
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#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';
}
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return i;
}
/**
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* 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 terminator)
* - `%#.*s` supplied byte length argument visualized (ignores nul terminator)
* - `%.*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
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*/
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;
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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);
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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);
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format++;
}
}
if (precision < 0) {
precision = 0;
}
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/* evaluate length field */
signbit = 31;
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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 */
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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 = '"';
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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,
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flags, alphabet) == -1) {
return -1;
}
break;
}
case 'f':
case 'F':
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if (signbit == 63) {
ldbl = va_arg(va, long double);
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} else {
ldbl = va_arg(va, double);
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}
if (!weaken(ftoa) ||
weaken(ftoa)(out, arg, ldbl, precision, width, flags) == -1) {
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return -1;
}
break;
case 'c':
precision = 1;
flags |= FLAGS_PRECISION;
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qchar = '\'';
p = charbuf;
charbuf[0] = va_arg(va, int); /* assume little endian */
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goto showstr;
case 'm':
p = weaken(strerror) ? weaken(strerror)(lasterr) : "?";
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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;
}
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break;
case '%':
if (out('%', arg) == -1) return -1;
break;
default:
if (out(format[-1], arg) == -1) return -1;
break;
}
}
return 0;
}