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index(3c) [opensolaris man page]

index(3C)						   Standard C Library Functions 						 index(3C)

NAME
index, rindex - string operations SYNOPSIS
#include <strings.h> char *index(const char *s, int c); char *rindex(const char *s, int c); DESCRIPTION
The index() and rindex() functions operate on null-terminated strings. The index() function returns a pointer to the first occurrence of character c in string s. The rindex() function returns a pointer to the last occurrence of character c in string s. Both index() and rindex() return a null pointer if c does not occur in the string. The null character terminating a string is considered to be part of the string. USAGE
On most modern computer systems, you can not use a null pointer to indicate a null string. A null pointer is an error and results in an abort of the program. If you wish to indicate a null string, you must use a pointer that points to an explicit null string. On some machines and with some implementations of the C programming language, a null pointer, if dereferenced, would yield a null string. Though often used, this practice is not always portable. Programmers using a null pointer to represent an empty string should be aware of this portability issue. Even on machines where dereferencing a null pointer does not cause an abort of the program, it does not necessarily yield a null string. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ |ATTRIBUTE TYPE |ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
bstring(3C), malloc(3C), string(3C), attributes(5), standards(5) SunOS 5.11 24 Jul 2002 index(3C)

Check Out this Related Man Page

strchr(3)						     Library Functions Manual							 strchr(3)

NAME
index, rindex, strchr, strrchr - Search for character in string LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <strings.h> char *index( const char *s, int c); char *rindex( const char *s, int c); #include <string.h> char *strchr( const char *s, int c); char *strrchr( const char *s, int c); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: index(), rindex(): XPG4-UNIX strchr(), strrchr(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies the string to search. Specifies a character, expressed as an int data type, to search for. DESCRIPTION
The index() function locates the first occurrence of the integer specified by the c parameter, which is converted to an unsigned char, in the string pointed to by the s parameter. The terminating null byte is treated as part of the string pointed to by the s parameter. The rindex() function locates the last occurrence of the integer specified by the c parameter, which is converted to a char value, in the string pointed to by the s parameter. The terminating null byte is treated as a part of the string pointed to by the s parameter. The strchr() and strrchr() functions provide the same functionality as the index() and rindex() functions, respectively. If c is a null byte ('') in any of these functions, the function locates the terminating null byte of s. RETURN VALUES
Upon successful completion, these functions return a pointer to the byte in the scanned string. When the byte specified by parameter c is not found, a null pointer is returned. RELATED INFORMATION
Functions: string(3), wcschr(3) Standards: standards(5) delim off strchr(3)
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