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sprintf with length modifiers is annoying...

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Wolfgang (Blub) Bumiller 2012-05-03 13:45:24 +02:00
parent 627ef279fd
commit 0f023bc219
1 changed files with 27 additions and 1 deletions
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28
ast.c
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@ -368,10 +368,36 @@ void ast_function_delete(ast_function *self)
mem_d(self);
}
static void ast_util_hexitoa(char *buf, size_t size, unsigned int num)
{
unsigned int base = 10;
#define checknul() do { if (size == 1) { *buf = 0; return; } } while (0)
#define addch(x) do { *buf++ = (x); --size; checknul(); } while (0)
if (size < 1)
return;
checknul();
if (!num)
addch('0');
else {
while (num)
{
int digit = num % base;
num /= base;
addch('0' + digit);
}
}
*buf = 0;
#undef addch
#undef checknul
}
const char* ast_function_label(ast_function *self, const char *prefix)
{
size_t id = (self->labelcount++);
sprintf(self->labelbuf, "%16s%8u", prefix, (unsigned int)id);
size_t len = strlen(prefix);
strncpy(self->labelbuf, prefix, sizeof(self->labelbuf));
ast_util_hexitoa(self->labelbuf + len, sizeof(self->labelbuf)-len, id);
return self->labelbuf;
}