41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
#include <fxlibc/string.h>
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/*
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** The strcmp() function compares the two strings s1 and s2. The locale is not
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** taken into account (for a locale-aware comparison, see strcoll(3)).
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** The comparison is done using unsigned characters.
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**
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** strcmp() returns an integer indicating the result of the comparison, as follows:
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** * 0, if the s1 and s2 are equal;
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** * a negative value if s1 is less than s2;
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** * a positive value if s1 is greater than s2.
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**
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** TODO: quad-word access !
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*/
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int strcmp(const char *s1, const char *s2)
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{
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if (s1 == NULL || s2 == NULL)
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return (0);
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while (*s1 != '\0' && *s2 != '\0' && *s1 == *s2) {
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s1 += 1;
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s2 += 1;
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}
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return (*s1 - *s2);
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}
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/*
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** The strncmp() function is similar, except it compares only the first (at most)
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** n bytes of s1 and s2.
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**
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** TODO: quad-word access !
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*/
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int strncmp(const char *s1, const char *s2, size_t n)
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{
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if (s1 == NULL || s2 == NULL || n == 0)
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return (0);
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size_t i = -1;
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while (++i < n - 1 && s1[i] != '\0' && s2[i] != '\0'
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&& s1[i] == s2[i]) ;
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return (s1[i] - s2[i]);
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}
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