mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-22 16:08:07 +01:00
159 lines
3.6 KiB
C++
159 lines
3.6 KiB
C++
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#include <posix.h>
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// Function to implement strncat() function in C
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char* strncat(char* destination, const char* source, size_t num)
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{
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// make ptr point to the end of destination string
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char* ptr = destination + strlen(destination);
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// Appends characters of source to the destination string
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while (*source != '\0' && num--)
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*ptr++ = *source++;
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// null terminate destination string
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*ptr = '\0';
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// destination string is returned by standard strncat()
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return destination;
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}
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#ifndef strcmp
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/*
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* Taken from glibc. Seems not optimized at all...
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*/
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/* Compare S1 and S2, returning less than, equal to or
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greater than zero if S1 is lexicographically less than,
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equal to or greater than S2. */
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int strcmp (const char *p1, const char *p2)
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{
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const unsigned char *s1 = (const unsigned char *) p1;
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const unsigned char *s2 = (const unsigned char *) p2;
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unsigned char c1, c2;
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do
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{
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c1 = (unsigned char) *s1++;
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c2 = (unsigned char) *s2++;
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if (c1 == '\0')
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return c1 - c2;
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}
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while (c1 == c2);
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return c1 - c2;
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}
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#endif
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#ifndef strncmp
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// faster implementation than AsciiStrnCmp. AsciiStrnCmp calls AsciiStrSize 4 times.
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//int strncmp( const char * s1, const char * s2, size_t n )
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//{
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// while ( n && *s1 && ( *s1 == *s2 ) )
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// {
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// ++s1;
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// ++s2;
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// --n;
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// }
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// if ( n == 0 )
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// {
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// return 0;
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// }
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// else
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// {
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// return ( *(unsigned char *)s1 - *(unsigned char *)s2 );
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// }
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//}
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/* Compare no more than N characters of S1 and S2,
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returning less than, equal to or greater than zero
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if S1 is lexicographically less than, equal to or
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greater than S2. */
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int
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strncmp(const char *s1, const char *s2, size_t n)
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{
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unsigned char c1 = '\0';
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unsigned char c2 = '\0';
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if (n >= 4)
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{
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size_t n4 = n >> 2;
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do
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{
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c1 = (unsigned char) *s1++;
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c2 = (unsigned char) *s2++;
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if (c1 == '\0' || c1 != c2)
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return c1 - c2;
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c1 = (unsigned char) *s1++;
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c2 = (unsigned char) *s2++;
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if (c1 == '\0' || c1 != c2)
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return c1 - c2;
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c1 = (unsigned char) *s1++;
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c2 = (unsigned char) *s2++;
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if (c1 == '\0' || c1 != c2)
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return c1 - c2;
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c1 = (unsigned char) *s1++;
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c2 = (unsigned char) *s2++;
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if (c1 == '\0' || c1 != c2)
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return c1 - c2;
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} while (--n4 > 0);
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n &= 3;
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}
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while (n > 0)
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{
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c1 = (unsigned char) *s1++;
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c2 = (unsigned char) *s2++;
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if (c1 == '\0' || c1 != c2)
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return c1 - c2;
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n--;
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}
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return c1 - c2;
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}
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//
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//// Got his here : http://mgronhol.github.io/fast-strcmp/
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//int strncmp_(const char *ptr0, const char *ptr1, size_t len)
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//{
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// size_t fast = len / sizeof(size_t) + 1;
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// size_t offset = (fast - 1) * sizeof(size_t);
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// size_t current_block = 0;
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//
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// if (len < sizeof(size_t)) {
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// fast = 0;
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// }
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//
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// size_t *lptr0 = (size_t*) ptr0;
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// size_t *lptr1 = (size_t*) ptr1;
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//
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// while (current_block < fast) {
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// if ((lptr0[current_block] ^ lptr1[current_block])) {
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// size_t pos;
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// for (pos = current_block * sizeof(size_t); pos < len; ++pos) {
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// if ((ptr0[pos] ^ ptr1[pos]) || (ptr0[pos] == 0) || (ptr1[pos] == 0)) {
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// return (int) ((unsigned char) ptr0[pos] - (unsigned char) ptr1[pos]);
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// }
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// }
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// }
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//
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// ++current_block;
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// }
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//
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// while (len > offset) {
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// if ((ptr0[offset] ^ ptr1[offset])) {
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// return (int) ((unsigned char) ptr0[offset] - (unsigned char) ptr1[offset]);
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// }
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// ++offset;
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// }
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//
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// return 0;
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//}
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#endif
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