Unix and Linux Discussions Tagged with null |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
5 |
3,757 |
AIX |
|
|
|
3 |
1,312 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
3,318 |
Shell Programming and Scripting |
|
|
|
2 |
3,040 |
Shell Programming and Scripting |
|
|
|
4 |
4,692 |
Shell Programming and Scripting |
|
|
|
3 |
4,820 |
Shell Programming and Scripting |
|
|
|
2 |
6,515 |
Programming |
|
|
|
3 |
3,382 |
Solaris |
|
|
|
3 |
12,054 |
Programming |
|
|
|
1 |
3,489 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
15,116 |
Programming |
|
|
|
2 |
3,800 |
Programming |
|
|
|
3 |
1,774 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
70,821 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
1,720 |
Shell Programming and Scripting |
|
|
|
5 |
3,605 |
Solaris |
|
|
|
3 |
10,943 |
Shell Programming and Scripting |
|
|
|
7 |
7,375 |
Shell Programming and Scripting |
|
|
|
2 |
10,171 |
Shell Programming and Scripting |
|
|
|
12 |
17,517 |
IP Networking |
|
|
|
4 |
39,746 |
Programming |
|
|
|
3 |
10,251 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
1,846 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
61,149 |
Shell Programming and Scripting |
|
|
|
0 |
2,890 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
9,040 |
Shell Programming and Scripting |
|
|
|
3 |
4,965 |
Shell Programming and Scripting |
|
|
|
1 |
2,734 |
Programming |
|
|
|
11 |
10,900 |
Shell Programming and Scripting |
|
|
|
12 |
38,573 |
Solaris |
|
|
|
4 |
6,000 |
UNIX for Advanced & Expert Users |
|
|
|
7 |
15,683 |
Shell Programming and Scripting |
|
|
|
4 |
4,678 |
UNIX for Dummies Questions & Answers |
|
|
|
0 |
3,389 |
Programming |
|
|
|
16 |
45,052 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
6,016 |
UNIX for Dummies Questions & Answers |
|
|
|
6 |
7,949 |
UNIX for Dummies Questions & Answers |
|
|
|
10 |
6,571 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
3,071 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
12,728 |
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)