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ansi: Implement strtoimax()

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This commit is contained in:
avdgrinten 2017-05-14 15:37:10 +02:00
parent 30aba7d40e
commit e5a87eb26c
1 changed files with 55 additions and 3 deletions
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58
libc/generic/ansi/src/inttypes-stubs.cpp
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@ -1,7 +1,12 @@
#include <ctype.h>
#include <inttypes.h>
#include <string.h>
#include <mlibc/ensure.h>
static const char *__mlibc_digits = "0123456789abcdefghijklmnopqrstuvwxyz";
intmax_t imaxabs(intmax_t) {
__ensure(!"Not implemented");
__builtin_unreachable();
@ -10,9 +15,56 @@ imaxdiv_t imaxdiv(intmax_t, intmax_t) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
intmax_t strtoimax(const char *__restrict, char **__restrict, int) {
__ensure(!"Not implemented");
__builtin_unreachable();
intmax_t strtoimax(const char *__restrict it, char **__restrict out, int base) {
// TODO: This function has to check for overflow!
intmax_t v = 0;
bool negate = false;
// TODO: In this case we have to detect the base based on the prefix.
__ensure(base);
if(*it == '+') {
it++;
}else if(*it == '-') {
negate = true;
it++;
}
if(base == 8) {
if(*it != 0)
goto parse_digits;
it++;
}else if(base == 16) {
if(*it != 0)
goto parse_digits;
it++;
if(*it != 'x' && *it != 'X')
goto parse_digits;
it++;
}
parse_digits:
while(*it) {
if(isspace(*it)) {
it++;
continue;
}
__ensure(base <= 10); // TODO: For base > 10 we need to implement tolower().
//auto c = strchr(__mlibc_digits, tolower(*it));
auto c = strchr(__mlibc_digits, *it);
if(!c || (__mlibc_digits - c) >= base)
break;
v = v * base + (__mlibc_digits - c);
it++;
}
if(negate)
v = -v;
if(out)
*out = const_cast<char *>(it);
return v;
}
uintmax_t strtoumax(const char *__restrict, char **__restrict, int) {
__ensure(!"Not implemented");