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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 (al_str_at(s, i) == '0' &&
((base == 16 && (al_str_at(s, i + 1) == 'x' || al_str_at(s, i + 1) == 'X')) ||
(base == 2 && (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 for expressing a number.
error = true;
break;
}
if (c >= base || ret > cutoff || (ret == cutoff && c > add_limit)) {
// Either the character is invalid for the requested base or
// attempting to add it would cause an overflow.
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;
// line must be zero'd before calling get_line() for the first time.
if (line->data == NULL) {
*line = *buffer;
} else {
// Move to the start of the next line, if it exists.
line->data += line->len + 1;
if ((bytes = line->data - buffer->data) >= buffer->len)
return false; // No more lines.
}
bytes = buffer->len - bytes;
char *nl = (char *)al_memchr(line->data, sep, bytes);
// If we couldn't find a separator, move to the end of the buffer.
line->len = !nl ? bytes : (u32)(nl - line->data);
return true;
}
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