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Top Forums Programming Returning local string value from a function in C Post 302524153 by Corona688 on Saturday 21st of May 2011 11:00:12 PM
Old 05-22-2011
Quote:
Originally Posted by vistastar
a) It's platform dependent. In most cases you need not, for example, linux, windows xp or latter. In DOS, a string literal may be modified.
HP-UX, also.

Yes, you should explicitly mention const. Use const whenever and wherever you don't want the programmer messing with the data's contents. Use it liberally. It's a safety feature.

b) what he said. The pointer is unmodifiable. I don't know if it's useful to return that, but you can have variables declared as that.

c) They don't interfere with each other, therefore no race condition. If two run at the same time, who cares? They don't write anything, don't change anything, don't use anything, don't compete.

d) A pointer is a reference. In C++ you have the & type, which can be a bit dangerous since there's no straightforward way to errorcheck it...
 

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wstring(3C)						   Standard C Library Functions 					       wstring(3C)

NAME
wstring, wscasecmp, wsncasecmp, wsdup, wscol - Process Code string operations SYNOPSIS
#include <widec.h> int wscasecmp(const wchar_t *s1, const wchar_t *s2); int wsncasecmp(const wchar_t *s1, const wchar_t *s2, int n); wchar_t *wsdup(const wchar_t *s); int wscol(const wchar_t *s); DESCRIPTION
These functions operate on Process Code strings terminated by wchar_t null characters. During appending or copying, these routines do not check for an overflow condition of the receiving string. In the following, s, s1, and s2 point to Process Code strings terminated by a wchar_t null. wscasecmp(), wsncasecmp() The wscasecmp() function compares its arguments, ignoring case, and returns an integer greater than, equal to, or less than 0, depending upon whether s1 is lexicographically greater than, equal to, or less than s2. It makes the same comparison but compares at most n Process Code characters. The four Extended Unix Code (EUC) codesets are ordered from lowest to highest as 0, 2, 3, 1 when characters from different codesets are compared. wsdup() The wsdup() function returns a pointer to a new Process Code string, which is a duplicate of the string pointed to by s. The space for the new string is obtained using malloc(3C). If the new string cannot be created, a null pointer is returned. wscol() The wscol() function returns the screen display width (in columns) of the Process Code string s. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------------------------------------+ |ATTRIBUTE TYPE ATTRIBUTE VALUE | |MT-Level MT-Safe | +-----------------------------------------------------------+ SEE ALSO
malloc(3C), string(3C), wcstring(3C), attributes(5) SunOS 5.11 29 Dec 1996 wstring(3C)
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