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#include "../include/al/str.h"
// https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=newlib/libc/stdlib/strtol.c;h=09d4333ed05f497ec00b7192204644349441e58d;hb=HEAD#l130
s64 al_str_to_long(str *s, s32 base)
{
u64 ret = 0;
u32 i = 0;
s32 neg = 0;
while (al_isspace(al_str_at(s, i)) && i < s->len) i++;
if (al_str_at(s, i) == '-') {
neg = 1;
i++;
} else if (al_str_at(s, i) == '+') {
i++;
}
if ((base == 16 && al_str_at(s, i) == '0' && // 0xbecd
(al_str_at(s, i + 1) == 'x' || al_str_at(s, i + 1) == 'X')) ||
(base == 2 && al_str_at(s, i) == '0' && // 0b01011101
(al_str_at(s, i + 1) == 'b' || al_str_at(s, i + 1) == 'B'))) {
i += 2;
}
u64 cutoff = neg ? -(u64)INT64_MIN : INT64_MAX;
s32 add_limit = cutoff % (u64)base;
cutoff /= (u64)base;
bool error = false;
for (; i < s->len; i++) {
char c = al_str_at(s, i);
if (c >= '0' && c <= '9') {
c -= '0';
} else if (c >= 'A' && c <= 'Z') {
c -= 'A' - 10;
} else if (c >= 'a' && c <= 'z') {
c -= 'a' - 10;
} else {
// Character not valid when expressing a number.
error = true;
break;
}
// Character invalid for given base or trying to add the next digit
// would cause an overflow/underflow.
if (c >= base || ret > cutoff || (ret == cutoff && c > add_limit)) {
error = true;
break;
}
ret = (ret * base) + c;
}
if (error) ret = neg ? INT64_MIN : INT64_MAX;
else if (neg) ret = -ret;
return ret;
}
bool al_str_get_line(str *buffer, char sep, str *line)
{
u32 bytes = 0;
if (line->data == NULL) {
*line = *buffer;
} else if ((bytes = (u32)((line->data += line->len + 1) - buffer->data)) >= buffer->len) {
// Move to the start of the assumed next line. If bytes >= buffer->len,
// there is no next line.
return false;
}
// Remaining bytes.
bytes = buffer->len - bytes;
char *nl = (char *)al_memchr(line->data, sep, bytes);
// If !nl, move to the end of the buffer.
line->len = !nl ? bytes : (u32)(nl - line->data);
return true;
}
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