/*
* Helper functions for outputting text.
* Copyright © 2011, 2021, 2023 Nick Bowler
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#include
#include
#include
#include "cdecl.h"
#include "cdecl-internal.h"
#include "parse.h"
#include "specstr.h"
size_t cdecl__advance(struct output_state *dst, size_t amount)
{
size_t x = MIN(amount, dst->dstlen);
dst->dst += x;
dst->dstlen -= x;
dst->accum += amount;
return amount;
}
size_t cdecl__strlcpy(char *dst, const char *src, size_t dstlen)
{
size_t srclen = strlen(src);
if (dstlen > 0) {
memcpy(dst, src, MIN(dstlen, srclen+1));
if (dstlen <= srclen)
dst[dstlen-1] = 0;
}
return srclen;
}
size_t cdecl__emit(struct output_state *dst, const char *src)
{
size_t rc = cdecl__strlcpy(dst->dst, src, dst->dstlen);
return cdecl__advance(dst, rc);
}
/*
* 31 decimal digits is enough for values up to 2^102 - 1.
* 63 decimal digits is enough for values up to 2^209 - 1.
*
* We can't portably write numbers this large in preprocessor conditionals,
* but since the maximum values of unsigned integer types are always one
* less than a power of two, we can use a sequence of small shifts to infer
* the bounds.
*
* All known implementations have 64-bit uintmax_t. Leave some headroom
* to support a possible future implementatons with 128-bit uintmax_t.
*/
enum {
#if (UINTMAX_MAX >> 27 >> 27 >> 26 >> 26) == 0
MAX_UINT_DIGITS = 31
#elif (UINTMAX_MAX >> 27 >> 26 >> 26 >> 26 >> 26 >> 26 >> 26 >> 26) == 0
MAX_UINT_DIGITS = 63
#else
# error UINTMAX_MAX is too large, please report a bug.
#endif
};
size_t cdecl__emit_uint(struct output_state *dst, uintmax_t val)
{
char buf[MAX_UINT_DIGITS + 1], *p = &buf[sizeof buf];
*(--p) = 0;
while (val > 0) {
*(--p) = '0' + val % 10;
val /= 10;
}
return cdecl__emit(dst, p);
}
static void explain_spec(struct output_state *dst, struct cdecl_declspec *s)
{
size_t rc;
rc = cdecl__emit(dst, spec_string(s->type));
if (s->ident) {
cdecl__emit(dst, " " + !rc);
cdecl__emit(dst, s->ident);
}
}
/*
* Render a list of declaration specifiers. Only the declaration specifiers
* listed in mask, which is the bitwise OR of the desired specifier kinds, are
* printed.
*/
const char *cdecl__emit_specs(struct output_state *dst,
struct cdecl_declspec *s,
unsigned mask)
{
const char *sep = " ";
int empty = 1;
for (; s; s = s->next) {
if (!(s->type & mask))
continue;
cdecl__emit(dst, sep + empty);
explain_spec(dst, s);
empty = 0;
}
return sep + empty;
}