Unix and Linux Discussions Tagged with null |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
5 |
4,248 |
AIX |
|
|
|
3 |
1,445 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
3,503 |
Shell Programming and Scripting |
|
|
|
2 |
3,178 |
Shell Programming and Scripting |
|
|
|
4 |
5,211 |
Shell Programming and Scripting |
|
|
|
3 |
4,950 |
Shell Programming and Scripting |
|
|
|
2 |
6,600 |
Programming |
|
|
|
3 |
3,677 |
Solaris |
|
|
|
3 |
13,123 |
Programming |
|
|
|
1 |
3,558 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
15,270 |
Programming |
|
|
|
2 |
4,001 |
Programming |
|
|
|
3 |
1,882 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
71,047 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
1,814 |
Shell Programming and Scripting |
|
|
|
5 |
3,793 |
Solaris |
|
|
|
3 |
11,199 |
Shell Programming and Scripting |
|
|
|
7 |
7,711 |
Shell Programming and Scripting |
|
|
|
2 |
10,266 |
Shell Programming and Scripting |
|
|
|
12 |
17,799 |
IP Networking |
|
|
|
4 |
40,278 |
Programming |
|
|
|
3 |
10,377 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
1,961 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
61,760 |
Shell Programming and Scripting |
|
|
|
0 |
2,935 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
9,178 |
Shell Programming and Scripting |
|
|
|
3 |
5,107 |
Shell Programming and Scripting |
|
|
|
1 |
2,836 |
Programming |
|
|
|
11 |
11,083 |
Shell Programming and Scripting |
|
|
|
12 |
39,775 |
Solaris |
|
|
|
4 |
6,103 |
UNIX for Advanced & Expert Users |
|
|
|
7 |
18,946 |
Shell Programming and Scripting |
|
|
|
4 |
4,793 |
UNIX for Dummies Questions & Answers |
|
|
|
0 |
3,556 |
Programming |
|
|
|
16 |
45,676 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
6,260 |
UNIX for Dummies Questions & Answers |
|
|
|
6 |
8,123 |
UNIX for Dummies Questions & Answers |
|
|
|
10 |
7,026 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
3,227 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
13,359 |
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)