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/* libmisc/fmt.c - Write formatted text
*
* Copyright (C) 2025 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <string.h> /* for strnlen() */
#include <libmisc/fmt.h>
static const char *const hexdig = "0123456789ABCDEF";
/* small/trivial formatters ***************************************************/
void fmt_print_byte(lo_interface fmt_dest w, uint8_t b) {
LO_CALL(w, putb, b);
}
void fmt_print_bool(lo_interface fmt_dest w, bool b) {
fmt_print_str(w, b ? "true" : "false");
}
void fmt_print_base16_u8_(lo_interface fmt_dest w, uint8_t x) {
fmt_print(w, "0x", (rjust, 2, '0', (base16, x)));
}
void fmt_print_base16_u16_(lo_interface fmt_dest w, uint16_t x) {
fmt_print(w, "0x", (rjust, 4, '0', (base16, x)));
}
void fmt_print_base16_u32_(lo_interface fmt_dest w, uint32_t x) {
fmt_print(w, "0x", (rjust, 8, '0', (base16, x)));
}
void fmt_print_base16_u64_(lo_interface fmt_dest w, uint64_t x) {
fmt_print(w, "0x", (rjust, 16, '0', (base16, x)));
}
void fmt_print_ptr(lo_interface fmt_dest w, void *ptr) {
LM_CAT3_(fmt_print_base16_u, __INTPTR_WIDTH__, _)(w, (uintptr_t)ptr);
}
/* quote **********************************************************************/
/**
* Quote a byte to ASCII-only C syntax.
*/
void fmt_print_qbyte(lo_interface fmt_dest w, uint8_t b) {
fmt_print_byte(w, '\'');
if (' ' <= b && b <= '~') {
if (b == '\'' || b == '\\')
fmt_print_byte(w, '\\');
fmt_print_byte(w, b);
} else {
fmt_print_byte(w, '\\');
fmt_print_byte(w, 'x');
fmt_print_byte(w, hexdig[(b >> 4) & 0xF]);
fmt_print_byte(w, hexdig[(b >> 0) & 0xF]);
}
fmt_print_byte(w, '\'');
}
/**
* Quote a region of memory to ASCII-only C string syntax. Valid
* UTF-8 is quoted as short C-escape characters, \uABCD, or
* \UABCDABCD; invalid UTF-8 is quoted as \xAB.
*/
void fmt_print_qmem(lo_interface fmt_dest w, const void *_str, size_t size) {
const uint8_t *str = _str;
fmt_print_byte(w, '"');
for (size_t pos = 0; pos < size;) {
uint32_t ch;
uint8_t chlen;
if ((str[pos] & 0b10000000) == 0b00000000) { ch = str[pos] & 0b01111111; chlen = 1; }
else if ((str[pos] & 0b11100000) == 0b11000000) { ch = str[pos] & 0b00011111; chlen = 2; }
else if ((str[pos] & 0b11110000) == 0b11100000) { ch = str[pos] & 0b00001111; chlen = 3; }
else if ((str[pos] & 0b11111000) == 0b11110000) { ch = str[pos] & 0b00000111; chlen = 4; }
else goto invalid_utf8;
if ((ch == 0 && chlen != 1) || pos + chlen > size) goto invalid_utf8;
for (uint8_t i = 1; i < chlen; i++) {
if ((str[pos+i] & 0b11000000) != 0b10000000) goto invalid_utf8;
ch = (ch << 6) | (str[pos+i] & 0b00111111);
}
if (ch > 0x10FFFF) goto invalid_utf8;
if (ch == '\0' ||
ch == '\b' ||
ch == '\f' ||
ch == '\n' ||
ch == '\r' ||
ch == '\t' ||
ch == '\v' ||
ch == '\\' ||
ch == '\'' ||
ch == '"' ||
ch == '?') {
/* short C-escape */
fmt_print_byte(w, '\\');
switch (ch) {
case '\0': fmt_print_byte(w, '0'); break;
case '\a': fmt_print_byte(w, 'a'); break;
case '\b': fmt_print_byte(w, 'b'); break;
case '\f': fmt_print_byte(w, 'f'); break;
case '\n': fmt_print_byte(w, 'n'); break;
case '\r': fmt_print_byte(w, 'r'); break;
case '\t': fmt_print_byte(w, 't'); break;
case '\v': fmt_print_byte(w, 'v'); break;
case '\\': fmt_print_byte(w, '\\'); break;
case '\'': fmt_print_byte(w, '\''); break;
case '"': fmt_print_byte(w, '"'); break;
case '?': fmt_print_byte(w, '?'); break;
}
} else if (' ' <= ch && ch <= '~') {
/* no escaping */
fmt_print_byte(w, ch);
} else if (ch < 0x10000) {
/* \uABCD */
fmt_print_byte(w, '\\');
fmt_print_byte(w, 'u');
fmt_print_byte(w, hexdig[(ch >> 12) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 8) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 4) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 0) & 0xF]);
} else {
/* \UABCDABCD */
fmt_print_byte(w, '\\');
fmt_print_byte(w, 'U');
fmt_print_byte(w, hexdig[(ch >> 28) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 24) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 20) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 16) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 12) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 8) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 4) & 0xF]);
fmt_print_byte(w, hexdig[(ch >> 0) & 0xF]);
}
pos += chlen;
continue;
invalid_utf8:
/* \xAB */
fmt_print_byte(w, '\\');
fmt_print_byte(w, 'x');
fmt_print_byte(w, hexdig[(str[pos] >> 4) & 0xF]);
fmt_print_byte(w, hexdig[(str[pos] >> 0) & 0xF]);
pos++;
}
fmt_print_byte(w, '"');
}
void fmt_print_qstr(lo_interface fmt_dest w, const char *str) {
fmt_print_qmem(w, str, strlen(str));
}
void fmt_print_qstrn(lo_interface fmt_dest w, const char *str, size_t n) {
fmt_print_qmem(w, str, strnlen(str, n));
}
/* int ************************************************************************/
#define declare(BASE, BITS) \
void _fmt_print_base##BASE##_s##BITS(lo_interface fmt_dest w, \
int##BITS##_t val) { \
if (val < 0) { \
fmt_print_byte(w, '-'); \
val = -val; \
} \
_fmt_print_base##BASE##_u##BITS(w, (uint##BITS##_t)val); \
} \
\
void _fmt_print_base##BASE##_u##BITS(lo_interface fmt_dest w, \
uint##BITS##_t absval) { \
/* This digit-counting is O(log(absval)); there are \
* `__builtin_clz`-based O(1) ways to do this, but when I \
* tried them they bloated the code-size too much. And this \
* function as a whole is already O(log(absval)) anyway \
* because of actually printing the digits. */ \
unsigned ndigits = 1; \
uint##BITS##_t div = 1; \
while (absval / div >= BASE) { \
div *= BASE; \
ndigits++; \
} \
\
for (unsigned i = 0; i < ndigits; i++) { \
unsigned digit = (unsigned) (absval / div); \
absval %= div; \
div /= BASE; \
fmt_print_byte(w, hexdig[digit]); \
} \
} \
LM_FORCE_SEMICOLON
declare(2, 8);
declare(2, 16);
declare(2, 32);
declare(2, 64);
declare(8, 8);
declare(8, 16);
declare(8, 32);
declare(8, 64);
declare(10, 8);
declare(10, 16);
declare(10, 32);
declare(10, 64);
declare(16, 8);
declare(16, 16);
declare(16, 32);
declare(16, 64);
#undef declare
/* fmt_buf ********************************************************************/
LO_IMPLEMENTATION_C(fmt_dest, struct fmt_buf, fmt_buf, static);
static void fmt_buf_putb(struct fmt_buf *buf, uint8_t b) {
if (buf->len < buf->cap)
((uint8_t *)(buf->dat))[buf->len] = b;
buf->len++;
}
static size_t fmt_buf_tell(struct fmt_buf *buf) {
return buf->len;
}
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