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Top Forums Programming Program received signal: “EXC_BAD_ACCESS”? Post 302524152 by Corona688 on Saturday 21st of May 2011 10:35:05 PM
Old 05-21-2011
Code:
char *string1;

This is a character pointer. On a 32-bit system, it takes 4 bytes, on a 64-bit system, 8 bytes. When I type in 'slartibartfast', where is it going to put it?

Inside the pointer? No, not enough room, and besides -- that's not how pointers work. The idea of a pointer is that it points to the memory you want to use, right?

So what memory have you got the pointer pointing to? Nothing? Uh-oh.

That leaves it at a random garbage value. Since pointers have no magic power of predicting what you want to do to them, it doesn't create memory for you to put things in and the pointer remains at what it started at -- some random garbage value. So scanf tries to store it in some undefined location in memory which naturally crashes

You should make the pointer actually point to something if you expect it to work. char string1[128]; or char *string1=malloc(128);
 

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SSAStringCpy(3SNMP)					      SNMP Library Functions					       SSAStringCpy(3SNMP)

NAME
SSAStringCpy, SSAStringInit, SSAStringToChar, SSAStringZero - Sun Solstice Enterprise Agent string helper functions SYNOPSIS
cc [ flag ... ] file ... -lssasnmp [ library .. ] #include <impl.h> void *SSAStringZero(String *string); int SSAStringInit(String *string, uchar_t *chars, int len, char *error_label); int SSAStringCpy(String *string1, String *string2, char *error_label); char *SSAStringToChar(String string); DESCRIPTION
The SSAStringCpy() function makes a deep copy of string2 to string1. This function assumes that string1 has been processed by the SSAS- tringZero() function. Memory is allocated inside the string1 and the contents of string2, not just the pointer, is copied to the string1. If an error is encountered, an error message is stored in the error_label buffer. The SSAStringInit() function copies the char array from chars to the string instance with the specified length len. This function assumes that the string instance has been processed by the SSAStringZero() function or no memory is allocated inside the string instance. If an error is encountered, an error message is stored in the error_label buffer. The SSAStringToChar() function returns a temporary char array buffer for printing purposes. The SSAStringZero() function frees the memory inside of the String instance, but not the string object itself. RETURN VALUES
The SSAStringInit() and SSAStringCpy() functions return 0 if successful and -1 if error. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Obsolete | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) SunOS 5.11 30 Apr 2006 SSAStringCpy(3SNMP)
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