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refactor iconv conversion descriptor encoding/decoding

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this change is made to avoid having assumptions about the encoding
spread out across the file, and to facilitate future change to a form
that can accommodate allocted, stateful descriptors when needed.

this commit should not produce any functional changes; with the
compiler tested the only change to code generation was minor
reordering of local variables on stack.
This commit is contained in:
Rich Felker 2017-11-10 00:13:16 -05:00
parent 30fdda6c99
commit 79f49effa0
1 changed files with 20 additions and 6 deletions
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26
src/locale/iconv.c
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@ -100,6 +100,21 @@ static size_t find_charmap(const void *name)
return -1; return -1;
} }
static iconv_t combine_to_from(size_t t, size_t f)
{
return (void *)(f<<16 | t);
}
static size_t extract_from(iconv_t cd)
{
return (size_t)cd >> 16;
}
static size_t extract_to(iconv_t cd)
{
return (size_t)cd & 0xffff;
}
iconv_t iconv_open(const char *to, const char *from) iconv_t iconv_open(const char *to, const char *from)
{ {
size_t f, t; size_t f, t;
@ -111,7 +126,7 @@ iconv_t iconv_open(const char *to, const char *from)
return (iconv_t)-1; return (iconv_t)-1;
} }
return (void *)(f<<16 | t); return combine_to_from(t, f);
} }
int iconv_close(iconv_t cd) int iconv_close(iconv_t cd)
@ -159,12 +174,11 @@ static unsigned legacy_map(const unsigned char *map, unsigned c)
return x ? x : c; return x ? x : c;
} }
size_t iconv(iconv_t cd0, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb) size_t iconv(iconv_t cd, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb)
{ {
size_t x=0; size_t x=0;
unsigned long cd = (unsigned long)cd0; unsigned to = extract_to(cd);
unsigned to = cd & 0xffff; unsigned from = extract_from(cd);
unsigned from = cd >> 16;
const unsigned char *map = charmaps+from+1; const unsigned char *map = charmaps+from+1;
const unsigned char *tomap = charmaps+to+1; const unsigned char *tomap = charmaps+to+1;
mbstate_t st = {0}; mbstate_t st = {0};
@ -322,7 +336,7 @@ size_t iconv(iconv_t cd0, char **restrict in, size_t *restrict inb, char **restr
if (totype-0300U > 8) k = 2; if (totype-0300U > 8) k = 2;
else k = "\10\4\4\10\4\4\10\2\4"[totype-0300]; else k = "\10\4\4\10\4\4\10\2\4"[totype-0300];
if (k > *outb) goto toobig; if (k > *outb) goto toobig;
x += iconv((iconv_t)(uintptr_t)to, x += iconv(combine_to_from(to, 0),
&(char *){"\303\212\314\204" &(char *){"\303\212\314\204"
"\303\212\314\214" "\303\212\314\214"
"\303\252\314\204" "\303\252\314\204"