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Wanted functionality #8

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b04bb71
Added strncmp prototype
linuxdevel Dec 9, 2015
3a0a298
Added untested implementation of strncmp
linuxdevel Dec 9, 2015
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20 changes: 20 additions & 0 deletions Flash.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -32,3 +32,23 @@ void _FLASH_STRING::print(Print &stream) const
stream.print(c); // print in char form
}
}

unsigned int _FLASH_STRING::strncmp(const char *s2, size_t n) {
size_t i;
size_t s2_len = strlen(s2);

if (s2_len < n) {
// s2 too short
return 1;
}

for (i = 0; i < n; i++) {
char c = (*this)[i];
if (0 == c || c != s2[i]) {
return 1;
}
}

return 0;

}
6 changes: 4 additions & 2 deletions Flash.h
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Expand Up @@ -88,7 +88,9 @@ class _FLASH_STRING : public _Printable
{ return static_cast<char>(pgm_read_byte(_arr + index)); }

void print(Print &stream) const;


unsigned int strncmp(const char *s2, size_t n);

private:
const prog_char *_arr;
};
Expand Down Expand Up @@ -230,4 +232,4 @@ inline Print &operator <<(Print &stream, const _FLASH_TABLE<T> &printable)
inline Print &operator <<(Print &stream, const _FLASH_STRING_ARRAY &printable)
{ printable.print(stream); return stream; }

#endif // def __FLASH_H__
#endif // def __FLASH_H__