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88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* this header file comes from libowfat, http://www.fefe.de/libowfat/ */
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#ifndef BYTE_H
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#define BYTE_H
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/* for size_t: */
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* dietlibc defines these in sys/cdefs.h, which is included from stddef.h */
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#ifndef __pure__
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#define __pure__
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#endif
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#ifndef __writememsz__
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#define __writememsz__(a,b)
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#define __readmemsz__(a,b)
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#endif
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/* byte_chr returns the smallest integer i between 0 and len-1
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* inclusive such that one[i] equals needle, or len if not found. */
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__readmemsz__(1,2)
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size_t byte_chr(const void* haystack, size_t len, char needle) __pure__;
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/* byte_rchr returns the largest integer i between 0 and len-1 inclusive
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* such that one[i] equals needle, or len if not found. */
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__readmemsz__(1,2)
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size_t byte_rchr(const void* haystack,size_t len,char needle) __pure__;
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/* byte_copy copies in[0] to out[0], in[1] to out[1], ... and in[len-1]
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* to out[len-1]. */
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__writememsz__(1,2)
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__readmemsz__(3,2)
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void byte_copy(void* out, size_t len, const void* in);
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/* byte_copyr copies in[len-1] to out[len-1], in[len-2] to out[len-2],
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* ... and in[0] to out[0] */
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__writememsz__(1,2)
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__readmemsz__(3,2)
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void byte_copyr(void* out, size_t len, const void* in);
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/* byte_diff returns negative, 0, or positive, depending on whether the
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* string a[0], a[1], ..., a[len-1] is lexicographically smaller
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* than, equal to, or greater than the string b[0], b[1], ...,
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* b[len-1]. When the strings are different, byte_diff does not read
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* bytes past the first difference. */
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__readmemsz__(1,2)
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__readmemsz__(3,2)
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int byte_diff(const void* a, size_t len, const void* b) __pure__;
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/* byte_zero sets the bytes out[0], out[1], ..., out[len-1] to 0 */
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__writememsz__(1,2)
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void byte_zero(void* out, size_t len);
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#define byte_equal(s,n,t) (!byte_diff((s),(n),(t)))
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/* Return 1 iff (b,blen) is a prefix of (a,alen), 0 otherwise.
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* Will abort early on mismatch */
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__readmemsz__(1,2)
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__readmemsz__(3,4)
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int byte_start(const void* a,size_t alen,const void* b,size_t blen) __pure__;
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/* equivalent to byte_start(a,alen,str,strlen(str)) */
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__readmemsz__(1,2)
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__readmem__(3)
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int byte_starts(const void* a,size_t alen,const char* str) __pure__;
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#if defined(__GNUC__) && !defined(__LIBOWFAT_INTERNAL)
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/* If str is a string constant, strlen will be done at compile time */
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#define byte_starts(a,alen,str) (__builtin_constant_p(str) ? byte_start(a,alen,str,strlen(str)) : byte_starts(a,alen,str))
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#endif
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__readmemsz__(1,2)
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__readmemsz__(3,2)
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int byte_equal_notimingattack(const void* a, size_t len,const void* b) __pure__;
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#if defined(__i386__) || defined(__x86_64__)
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#define UNALIGNED_ACCESS_OK
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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