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#include <stringh> size_t strlen(const char *str);
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The strlen( ) function returns the length of the null-terminated string pointed to by str The null terminator is not counted Example The following code fragment prints 5 on the screen:
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printf("%d", strlen("hello"));
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Related Functions memcpy( ), strchr( ), strcmp( ), and strncmp( ) strncat
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#include <stringh> char *strncat(char *str1, const char *str2, size_t count);
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The strncat( ) function concatenates not more than count characters of the string pointed to by str2 to the string pointed to by str1 and terminates str1 with a null The null terminator originally ending str1 is overwritten by the first character of str2 The string str2 is untouched by the operation If the strings overlap, the behavior is undefined In C99, str1 and str2 are qualified by restrict The strncat( ) function returns str1 Remember that no bounds checking takes place, so it is the programmer's responsibility to ensure that str1 is large enough to hold both its original contents and also those of str2 Example This program appends the first string read from stdin to the second and prevents an array overflow from occurring to s1 For example, assuming the user enters hello and there, the program prints therehello
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#include <stdioh> #include <stringh> int main(void) { char s1[80], s2[80]; unsigned int len; gets(s1); gets(s2); /* compute how many chars will actually fit */ len = 79-strlen(s2);
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Page 375 strncat(s2, s1, len); printf(s2); return 0; }
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Related Functions strcat( ), strnchr( ), strncmp( ), and strncpy( ) strncmp
#include <stringh> int strncmp(const char *str1, const char *str2, size_t count);
The strncmp( ) function lexicographically compares not more than count characters from the two null-terminated strings and returns an integer based on the outcome, as shown here: Value Less than zero Zero Greater than zero Meaning str1 is less than str2 str1 is equal to str2 str1 is greater than str2
If there are less than count characters in either string, the comparison ends when the first null is encountered Example The following function compares the first eight characters of two command line arguments and reports if they are equal:
#include <stdioh> #include <stringh> #include <stdlibh> int main(int argc, char *argv[])
Page 376 { if(argc!=3) { printf(''Incorrect number of arguments"); exit(1); } if(!strncmp(argv[1], argv[2], 8)) printf("The strings are the same\n"); return 0; }
Related Functions strcmp( ), strchr( ), and strncpy( ) strncpy
#include <stringh> char *strncpy(char *str1, const char *str2, size_t count);
The strncpy( ) function copies up to count characters from the string pointed to by str2 into the array pointed to by str1 str2 must be a pointer to a null-terminated string In C99, str1 and str2 are qualified by restrict If str1 and str2 overlap, the behavior of strncpy( ) is undefined If the string pointed to by str2 has less than count characters, nulls will be appended to the end of str1 until count characters have been copied Alternatively, if the string pointed to by str2 is longer than count characters, the resultant array pointed to by str1 will not be null terminated The strncpy( ) function returns a pointer to str1 Example The following code fragment copies at most 79 characters of str1 into str2, thus ensuring that no array boundary overflow occurs
char str1[128], str2[80]; gets(str1); strncpy(str2, str1, 79);
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Related Functions memcpy( ), strchr( ), strncat( ), and strncmp( ) strpbrk
#include <stringh> char *strpbrk(const char *str1, const char *str2);
The strpbrk( ) function returns a pointer to the first character in the string pointed to by str1 that matches any character in the string pointed to by str2 The null terminators are not included If there are no matches, a null pointer is returned Example This program prints the message s is a test on the screen:
#include <stdioh> #include <stringh> int main (void) { char *p; p = strpbrk("this is a test", " absj"); printf (p); return 0; }
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