Unix and Linux Discussions Tagged with null |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
5 |
4,063 |
AIX |
|
|
|
3 |
1,397 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
3,446 |
Shell Programming and Scripting |
|
|
|
2 |
3,138 |
Shell Programming and Scripting |
|
|
|
4 |
5,041 |
Shell Programming and Scripting |
|
|
|
3 |
4,910 |
Shell Programming and Scripting |
|
|
|
2 |
6,574 |
Programming |
|
|
|
3 |
3,538 |
Solaris |
|
|
|
3 |
12,598 |
Programming |
|
|
|
1 |
3,530 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
15,186 |
Programming |
|
|
|
2 |
3,909 |
Programming |
|
|
|
3 |
1,830 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
70,949 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
1,778 |
Shell Programming and Scripting |
|
|
|
5 |
3,714 |
Solaris |
|
|
|
3 |
11,092 |
Shell Programming and Scripting |
|
|
|
7 |
7,576 |
Shell Programming and Scripting |
|
|
|
2 |
10,225 |
Shell Programming and Scripting |
|
|
|
12 |
17,703 |
IP Networking |
|
|
|
4 |
40,044 |
Programming |
|
|
|
3 |
10,329 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
1,910 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
61,503 |
Shell Programming and Scripting |
|
|
|
0 |
2,921 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
9,123 |
Shell Programming and Scripting |
|
|
|
3 |
5,061 |
Shell Programming and Scripting |
|
|
|
1 |
2,784 |
Programming |
|
|
|
11 |
11,035 |
Shell Programming and Scripting |
|
|
|
12 |
39,204 |
Solaris |
|
|
|
4 |
6,068 |
UNIX for Advanced & Expert Users |
|
|
|
7 |
18,699 |
Shell Programming and Scripting |
|
|
|
4 |
4,738 |
UNIX for Dummies Questions & Answers |
|
|
|
0 |
3,479 |
Programming |
|
|
|
16 |
45,400 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
6,139 |
UNIX for Dummies Questions & Answers |
|
|
|
6 |
8,047 |
UNIX for Dummies Questions & Answers |
|
|
|
10 |
6,829 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
3,155 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
13,066 |
UNIX for Dummies Questions & Answers |
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)