10-20-2008
A character array is never empty. It is a contiguous array of memory cells, each of which contains some value. You are using a character array to represent strings; as such, you must manage the terminating NULL byte '\0'.
[ xxx deleted backwards description xxx ]
It is not useful to attempt to diagnose other errors you see when there are likely out of bounds array copies occurring, as the stack becomes trashed.
Never use any function that copies memory from one location to another which is of unknown length, or copy a know length to an offset that would make the copy exceed the bounds of the variable or data structure. Use strncat() or strncpy() to ensure the copy never exceeds the variable's bounds.
Last edited by MrC; 10-21-2008 at 09:13 PM..
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strncat(3) Library Functions Manual strncat(3)
NAME
strncat, strncmp, strncpy - Perform operations on string
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <string.h>
char *strncat(
char *s1,
const char *s2,
size_t n);
int strncmp(
const char *s1,
const char *s2,
size_t n);
char *strncpy(
char *s1,
const char *s2,
size_t n);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
strncat(), strncmp(), strncpy(): XSH4.2
Refer to the standards(5) reference page for more information about industry standards and associated tags.
PARAMETERS
Points to a location containing the first string or array. Points to a location containing the second array. Specifies the number of
bytes. In strncat(), n specifies the maximum number of bytes to append; in strncmp(), n specifies the maximum number of bytes to compare;
and in strncpy(), n specifies the number of bytes to copy.
DESCRIPTION
The strncat() function appends no more than n bytes from the array pointed to by the s2 parameter to the end of the array pointed to by the
s1 parameter. The initial byte of the array pointed to by s2 overwrites the null byte at the end of a string pointed to by s1. It then
appends a null byte to the result, and returns s1. When operating on overlapping objects, the behavior of this function is unreliable.
The strncmp() function compares the string or array pointed to by the s1 parameter to the array pointed to by the s2 parameter. The sign
of a nonzero value returned by strcmp() is determined by the sign of the difference between the values of the first pair of bytes (both
interpreted as unsigned char) that differ in the two compared objects. The strncmp() functions compares bytes until it has compared n bytes
or until it reaches a terminating null byte.
The strncmp() function compares objects based on the machine collating order. It does not use the locale-dependent sorting order. Use the
strcoll() or wcscoll() functions for locale-dependent sorting.
The strncpy() function copies no more than n bytes from the array pointed to by the s2 parameter to the array pointed to by the s1 parame-
ter. Bytes following a null byte are not copied. When operating on overlapping locations, the behavior of this function is unreliable.
When the location pointed to by the s2 parameter is an array that is shorter than n bytes, null bytes are appended to the s1 value until n
bytes in all are written.
RETURN VALUES
Upon successful completion, the strncat() and strncpy() functions return a pointer to the resulting string or array. [Tru64 UNIX] Other-
wise, these functions return a null pointer.
Upon successful completion, the strncmp() function returns an integer whose value is greater than, equal to, or less than 0 (zero), accord-
ing to whether the value of the s1 object is greater than, equal to, or less than the value of the s2 object. [Tru64 UNIX] When a success-
ful comparison cannot be made, strncmp() returns a value of 0 (zero).
RELATED INFORMATION
Functions: string(3), strcasecmp(3), strcat(3), strcmp(3), strcoll(3), strcpy(3), wcscoll(3), wcsncat(3), wcsncmp(3), wcsncpy(3)
Standards: standards(5) delim off
strncat(3)