Maybe use sscanf?

[AndrewChe7]

tinyobjloader-c/tinyobj_loader_c.h

Line 196 in 1ee072e

static int my_atoi(const char *c) {

for atoi function really hard to check errors, because it returns integer for input params, so you can't check it for bad input. You can use sscanf(buf, "%d", &n) to get integer from string and return value will be != 1 if there is problems.

[syoyo]

I want libc free and libc's atoi() and sscanf is affected by locale(e.g. see https://forum.openframeworks.cc/t/problem-with-locale-and-sscanf-ofximgui-related/30178 ), so provided our own implementation.

You can send a better atoi implementation(e.g. implement more robust one add more error checks). PR is always welcome.