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// This file defines some of the helper functions used for printing values
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "fpconv.h"
#include "print.h"
#include "util.h"
public int _print_int(FILE *f, int64_t n)
{
char buf[21] = {[20]=0}; // Big enough for INT64_MIN + '\0'
char *p = &buf[19];
bool negative = n < 0;
if (n == 0)
*(p--) = '0';
for (; n > 0; n /= 10)
*(p--) = '0' + (n % 10);
if (negative)
*(p--) = '-';
return fwrite(p + 1, sizeof(char), (size_t)(&buf[19] - p), f);
}
public int _print_uint(FILE *f, uint64_t n)
{
char buf[21] = {[20]=0}; // Big enough for UINT64_MAX + '\0'
char *p = &buf[19];
if (n == 0)
*(p--) = '0';
for (; n > 0; n /= 10)
*(p--) = '0' + (n % 10);
return fwrite(p + 1, sizeof(char), (size_t)(&buf[19] - p), f);
}
public int _print_hex(FILE *f, hex_format_t hex)
{
int printed = 0;
if (!hex.no_prefix) printed += fputs("0x", f);
if (hex.digits > 0) {
for (uint64_t n = hex.n; n > 0 && hex.digits > 0; n /= 16) {
hex.digits -= 1;
}
for (; hex.digits > 0; hex.digits -= 1) {
printed += fputc('0', f);
}
}
char buf[9] = {[8]='\0'}; // Enough space for FFFFFFFF + '\0'
char *p = &buf[7];
for (uint64_t n = hex.n; n > 0; n /= 16) {
uint8_t digit = n % 16;
if (digit <= 9)
*(p--) = '0' + digit;
else if (hex.uppercase)
*(p--) = 'A' + digit - 10;
else
*(p--) = 'a' + digit - 10;
}
printed += (int)fwrite(p + 1, sizeof(char), (size_t)(&buf[7] - p), f);
return printed;
}
public int _print_oct(FILE *f, oct_format_t oct)
{
int printed = 0;
if (!oct.no_prefix) printed += fputs("0o", f);
if (oct.digits > 0) {
for (uint64_t n = oct.n; n > 0 && oct.digits > 0; n /= 8) {
oct.digits -= 1;
}
for (; oct.digits > 0; oct.digits -= 1) {
printed += fputc('0', f);
}
}
char buf[12] = {[11]='\0'}; // Enough space for octal UINT64_MAX + '\0'
char *p = &buf[10];
for (uint64_t n = oct.n; n > 0; n /= 8) {
*(p--) = '0' + (n % 8);
}
printed += (int)fwrite(p + 1, sizeof(char), (size_t)(&buf[10] - p), f);
return printed;
}
public int _print_double(FILE *f, double n)
{
static char buf[24];
int len = fpconv_dtoa(n, buf);
return (int)fwrite(buf, sizeof(char), (size_t)len, f);
}
public int _print_char(FILE *f, char c)
{
#define ESC(e) "'\\" e "'"
const char *named[256] = {['\'']=ESC("'"), ['\\']=ESC("\\"),
['\n']=ESC("n"), ['\t']=ESC("t"), ['\r']=ESC("r"),
['\033']=ESC("e"), ['\v']=ESC("v"), ['\a']=ESC("a"), ['\b']=ESC("b")};
const char *name = named[(uint8_t)c];
if (name != NULL)
return fputs(name, f);
else if (isprint(c))
return fputc('\'', f) + fputc(c, f) + fputc('\'', f);
else
return (fputs("'\\x", f) + _print_hex(f, hex((uint64_t)c, .digits=2, .no_prefix=true, .uppercase=true))
+ fputs("'", f));
#undef ESC
}
public int _print_quoted(FILE *f, quoted_t quoted)
{
#define ESC(e) "\\" e
const char *named[256] = {['"']=ESC("\""), ['\\']=ESC("\\"),
['\n']=ESC("n"), ['\t']=ESC("t"), ['\r']=ESC("r"),
['\033']=ESC("e"), ['\v']=ESC("v"), ['\a']=ESC("a"), ['\b']=ESC("b")};
int printed = fputc('"', f);
for (const char *p = quoted.str; *p; p++) {
const char *name = named[(uint8_t)*p];
if (name != NULL) {
printed += fputs(name, f);
} else if (isprint(*p) || (uint8_t)*p > 0x7F) {
printed += fputc(*p, f);
} else {
printed += fputs("\\x", f) + _print_hex(f, hex((uint64_t)*p, .digits=2, .no_prefix=true, .uppercase=true));
}
}
printed += fputc('"', f);
#undef ESC
return printed;
}
#if defined(__GLIBC__) && defined(_GNU_SOURCE)
// GLIBC has fopencookie()
static ssize_t _gc_stream_write(void *cookie, const char *buf, size_t size) {
gc_stream_t *stream = (gc_stream_t *)cookie;
if (stream->position + size + 1 > *stream->size)
*stream->buffer = GC_REALLOC(*stream->buffer, (*stream->size += MAX(MAX(16UL, *stream->size/2UL), size + 1UL)));
memcpy(&(*stream->buffer)[stream->position], buf, size);
stream->position += size;
(*stream->buffer)[stream->position] = '\0';
return (ssize_t)size;
}
public FILE *gc_memory_stream(char **buf, size_t *size) {
gc_stream_t *stream = GC_MALLOC(sizeof(gc_stream_t));
stream->size = size;
stream->buffer = buf;
*stream->size = 16;
*stream->buffer = GC_MALLOC_ATOMIC(*stream->size);
(*stream->buffer)[0] = '\0';
stream->position = 0;
cookie_io_functions_t functions = {.write = _gc_stream_write};
return fopencookie(stream, "w", functions);
}
#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
// BSDs have funopen() and fwopen()
static int _gc_stream_write(void *cookie, const char *buf, int size) {
gc_stream_t *stream = (gc_stream_t *)cookie;
if (stream->position + size + 1 > *stream->size)
*stream->buffer = GC_REALLOC(*stream->buffer, (*stream->size += MAX(MAX(16UL, *stream->size/2UL), size + 1UL)));
memcpy(&(*stream->buffer)[stream->position], buf, size);
stream->position += size;
(*stream->buffer)[stream->position] = '\0';
return size;
}
public FILE *gc_memory_stream(char **buf, size_t *size) {
gc_stream_t *stream = GC_MALLOC(sizeof(gc_stream_t));
stream->size = size;
stream->buffer = buf;
*stream->size = 16;
*stream->buffer = GC_MALLOC_ATOMIC(*stream->size);
(*stream->buffer)[0] = '\0';
stream->position = 0;
return fwopen(stream, _gc_stream_write);
}
#else
# error "This platform doesn't support fopencookie() or funopen()!"
#endif
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
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