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/** @file ../include/strings.h
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@internalComponent
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*/
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/** @fn bcmp(const void *b1, const void *b2, size_t length)
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@param b1
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@param b2
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@param length
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@return bcmp function returns 0 if the byte sequences are equal and non-zero
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otherwise.
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The bcmp function compares byte string b1 against byte string b2, returning zero if they are identical and non-zero otherwise. Both
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strings are assumed to be length bytes long. Zero-length strings are always identical.
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The strings may overlap.
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Examples:
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@code
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#include <string.h>
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#include <stdio.h>
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int main()
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{
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int ret = 0;
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ret = bcmp("a","a",1);
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printf("bcmp(\"a\",\"a\",1) is %d",ret);
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ret = bcmp("abcd","abce",4);
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printf("
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bcmp(\"abcd\",\"abce\",1) is %d",ret);
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ret = bcmp("abc","xyz",0);
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printf("
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bcmp(\"abc\",\"xyz\",0) is %d",ret);
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return 0;
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}
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@endcode
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Output
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@code
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bcmp("a","a",1) is 0
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bcmp("abcd","abce",1) is -1
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bcmp("abc","xyz",0) is 0
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@endcode
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@see memcmp()
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@see strcasecmp()
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@see strcmp()
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@see strcoll()
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@see strxfrm()
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@publishedAll
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@externallyDefinedApi
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*/
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/** @fn bcopy(const void *src0, void *dst0, size_t length)
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@param src0
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@param dst0
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@param length
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The bcopy function copies length bytes from string src0 to string dst0 . The two strings may overlap. If length is zero no bytes are copied.
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Examples:
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@code
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#include <string.h>
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#include <stdio.h>
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int main()
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{
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char dst[50];
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bcopy("Hello World",dst,12);
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printf("Destination string after bcopy = %s
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",dst);
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return 0;
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}
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@endcode
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Output
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@code
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Destination string after bcopy = Hello World
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@endcode
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@see memccpy()
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@see memcpy()
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@see memmove()
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@see strcpy()
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@publishedAll
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@externallyDefinedApi
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*/
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/** @fn bzero(void *b, size_t len)
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@param b
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@param len
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The bzero function
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writes len zero bytes to the string b. If len is zero, bzero does nothing.
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Examples:
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@code
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#include <string.h>
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#include <stdio.h>
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int main()
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{
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char dst[50] = "abcdef";
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bzero(dst + 2, 2);
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if(!strcmp(dst, "ab")) printf("dst = %s
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",dst);
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if(!strcmp(dst+3, "")) printf("zeros added to dst string
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");
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if(!strcmp(dst + 4, "ef")) printf("dst + 4 = %s
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",dst);
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return 0;
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}
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@endcode
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Output
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@code
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dst = ab
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zeros added to dst string
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dst + 4 = ab
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@endcode
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@see memset()
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@see swab()
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@publishedAll
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@externallyDefinedApi
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*/
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/** @fn ffs(int mask)
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@param mask
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Note: This description also covers the following functions -
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ffsl() fls() flsl()
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@return
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The ffs and ffsl functions find the first bit set in mask and return the index of that bit.
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The fls and flsl functions find the last bit set in mask and return the index of that bit.
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Bits are numbered starting from 1, starting at the right-most
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(least significant) bit.
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A return value of zero from any of these functions means that the
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argument was zero.
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Examples:
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@code
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#include <string.h>
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#include <stdio.h>
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int main()
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{
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int i = 0x10;
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int j = ffs(i);
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if(j == 5) printf("First bit position in 0x10 is %d
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",j);
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return 0;
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}
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@endcode
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Output
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@code
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First bit position in 0x10 is 5
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@endcode
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@publishedAll
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@externallyDefinedApi
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*/
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/** @fn index(const char *p, int ch)
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@param p
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@param ch
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Note: This description also covers the following functions -
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rindex()
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@return The functions index and rindex return a pointer to the located character, or NULL if the character does not appear in the string.
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The index function locates the first occurrence of ch (converted to a char ) in the string pointed to by p. The terminating null character is considered part of the string; therefore if ch is ‘\\0,’ the functions locate the terminating ‘\\0.’
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The rindex function is identical to index, except it locates the last occurrence of ch.
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Examples:
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@code
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#include <string.h>
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#include <stdio.h>
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int main()
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{
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char one[50];
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char* ret;
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strcpy(one,"abcd");
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ret = index(one, ’c’);
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if(!strncmp(one+2,ret,1)) printf("index of \ ’c\ ’ in string \"abcd\" is %d \n",2);
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ret = index(one, ’z’);
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if(ret == NULL) printf("\ ’z\ ’ not found in string \"abcd\"\n");
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ret = index(one, ’\0’);
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if(!strncmp(one+4,ret,1)) printf("index of \ ’\ \0\ ’ in string \"abcd\" is %d\n",4);
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strcpy(one,"cdcab");
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ret = rindex(one, ’c’);
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if(!strncmp(one+2,ret,1)) printf("rindex of \ ’c\ ’ in string \"cscab\" is %d\n",2);
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strcpy(one,"dcab");
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ret = rindex(one, ’\0’);
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if(!strncmp(one+4,ret,1)) printf("index of \ ’\ \0\ ’ in string \"dcab\" is %d\n",4);
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return 0;
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}
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@endcode
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Output
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@code
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index of ’c’ in string "abcd" is 2
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’z’ not found in string "abcd"
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index of ’\0’ in string "abcd" is 4
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rindex of ’c’ in string "cscab" is 2
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index of ’\0’ in string "dcab" is 4
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@endcode
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@see memchr()
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@see strchr()
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@see strcspn()
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@see strpbrk()
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@see strsep()
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@see strspn()
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@see strstr()
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@see strtok()
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@publishedAll
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@externallyDefinedApi
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*/
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/** @fn rindex(const char *p, int ch)
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@param p
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@param ch
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Refer to index() for the documentation
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@see memchr()
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@see strchr()
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@see strcspn()
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@see strpbrk()
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@see strsep()
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@see strspn()
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@see strstr()
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@see strtok()
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@publishedAll
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@externallyDefinedApi
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*/
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/** @fn strcasecmp(const char *s1, const char *s2)
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@param s1
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@param s2
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Note: This description also covers the following functions -
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strncasecmp()
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@return The strcasecmp and strncasecmp return an integer greater than, equal to, or less than 0,
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according to whether s1 is lexicographically greater than, equal to, or less than s2 after translation of each corresponding character to lower-case. The
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strings themselves are not modified.
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The strcasecmp and strncasecmp functions
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compare the null-terminated strings s1 and s2. The strcasecmp() function compares the two strings s1 and s2 , ignoring
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the case of the characters.
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The strncasecmp compares at most len characters.
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Examples:
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@code
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#include <string.h>
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#include <stdio.h>
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int main()
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{
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int ret;
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ret = strcasecmp("ABC","abc");
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printf("strcasecmp of \"ABC\" \"abc\" is %d
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",ret);
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ret = strcasecmp("abc","abc");
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printf("strcasecmp of \"abc\" \"abc\" is %d
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",ret);
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return 0;
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}
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@endcode
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Output
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@code
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strcasecmp of "ABC" "abc" is 0
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strcasecmp of "abc" "abc" is 0
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@endcode
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@see bcmp()
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@see memcmp()
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@see strcmp()
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@see strcoll()
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@see strxfrm()
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@see tolower()
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@publishedAll
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@externallyDefinedApi
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*/
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/** @fn strncasecmp(const char *s1, const char *s2, size_t n)
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@param s1
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@param s2
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@param n
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Refer to strcasecmp() for the documentation
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@see bcmp()
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@see memcmp()
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@see strcmp()
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@see strcoll()
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@see strxfrm()
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@see tolower()
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@publishedAll
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@externallyDefinedApi
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*/
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