39 lines
888 B
C
39 lines
888 B
C
#pragma once
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#ifndef LWIP_PORT_STDLIB_H
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#define LWIP_PORT_STDLIB_H
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/*
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* Minimal freestanding stdlib shim for lwIP.
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*
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* lwIP 2.2.1 includes <stdlib.h> in a couple of files only for atoi(). If MSVC
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* finds the UCRT header, it drags errno.h into the kernel build and then lwIP's
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* own errno values collide with UCRT's. Put this header first in lwIP's include
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* path so those sources stay freestanding.
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*/
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static __inline int atoi(const char* s) {
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int sign = 1;
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int value = 0;
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if (!s)
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return 0;
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while (*s == ' ' || *s == '\t' || *s == '\n' || *s == '\r' || *s == '\v' || *s == '\f')
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++s;
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if (*s == '-') {
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sign = -1;
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++s;
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} else if (*s == '+') {
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++s;
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}
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while (*s >= '0' && *s <= '9') {
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value = value * 10 + (*s - '0');
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++s;
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}
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return sign * value;
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}
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#endif /* LWIP_PORT_STDLIB_H */
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