STRING.3
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- STRING(3) Minix Programmer's Manual STRING(3)
- NAME
- string, strcat, strncat, strcmp, strncmp, strcpy, strncpy, strlen, index,
- rindex - string operations string, strcat, strncat, strcmp, strncmp,
- strcpy, strncpy, strlen, strchr, strrchr, strerror, memcmp, memcpy,
- memmove, memchr, memset, index, rindex - string operations
- SYNOPSIS
- #include <sys/types.h>
- #include <strings.h>
- char *strcat(char *s1, const char *s2)
- char *strncat(char *s1, const char *s2, size_t n)
- int strcmp(const char *s1, const char *s2)
- int strncmp(const char *s1, const char *s2, size_t n)
- char *strcpy(char *s1, const char *s2)
- char *strncpy(char *s1, const char *s2, size_t n)
- size_t strlen(const char *s)
- char *strchr(const char *s, int c)
- char *strrchr(const char *s, int c)
- char *strerror(int errnum)
- int memcmp(const void *s1, const void *s2, size_t n)
- void *memcpy(void *s1, const void *s2, size_t n)
- void *memmove(void *s1, const void *s2, size_t n)
- void *memchr(const void *s, int c, size_t n)
- void *memset(void *s, int c, size_t n)
- char *index(const char *s, int c)
- char *rindex(const char *s, int c)
- DESCRIPTION
- These functions operate on null-terminated strings. They do not check
- for overflow of any receiving string.
- Strcat appends a copy of string s2 to the end of string s1. Strncat
- copies at most n characters. Both return a pointer to the null-
- terminated result.
- Strcmp compares its arguments and returns an integer greater than, equal
- to, or less than 0, according as s1 is lexicographically greater than,
- equal to, or less than s2. Strncmp makes the same comparison but looks
- at at most n characters.
- Strcpy copies string s2 to s1, stopping after the null character has been
- moved. Strncpy copies exactly n characters, truncating or null-padding
- s2; the target may not be null-terminated if the length of s2 is n or
- more. Both return s1.
- Strlen returns the number of non-null characters in s.
- 4BSD May 15, 1985 1
-
- STRING(3) Minix Programmer's Manual STRING(3)
- Strchr (strrchr) returns a pointer to the first (last) occurrence of
- character c in string s, or null if c does not occur in the string.
- Strerror returns the error string for the system call error errnum. See
- intro(2).
- Memcmp is like strcmp except that the strings are memory blocks of length
- n. Null characters are treated as ordinary characters.
- Memcpy copies n bytes from the location pointed to by s2 to s1. Memmove
- is like memcpy, except that it can handle overlap between the two
- strings. Both functions return s1.
- Memchr returns a pointer to the first occurrence of character c in string
- s, or null if c does not occur in the string.
- Memset sets n bytes to c starting at location s. It returns s.
- Index and rindex are obsolete versions of strchr and strrchr. New code
- should avoid using them.
- NOTES
- Characters are compared as unsigned char, whether char itself is signed
- or not.
- 4BSD May 15, 1985 2
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