C2007-10-03
Using realloc() Function in C
The realloc() function changes the size of a block of memory that was previously allocated with malloc() or calloc(). The function prototype is void *realloc(void *ptr, size_t size
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C2007-10-03
Using calloc() Function in C
The calloc() function also allocates memory. Rather than allocating a group of bytes as malloc() does, calloc() allocates a group of objects. The function prototype is void *calloc
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Using malloc() Function in C
The malloc() function isn't limited to allocating memory for strings, of course; it can allocate space for any storage need. This function allocates memory by the byte. Recall that
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A Storage Allocator sample program in C
In this tutorial let us write a storage allocator which is unrestricted. Calls to malloc and free may occur in any order; malloc calls upon the operating system to obtain more memo
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Listing Files and Directories sample program in C
A different kind of file system interaction is sometimes called for - determining information about a file, not what it contains. A directory-listing program such as the UNIX comma
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Fopen and Getc implementation program in C
Files in the standard library are described by file pointers rather than file descriptors. A file pointer is a pointer to a structure that contains several pieces of information ab
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C2007-09-26
lseek() sample program in C
Input and output are normally sequential: each read or write takes place at a position in the file right after the previous one. When necessary, however, a file can be read or writ
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Open, Creat, Close, Unlink system calls sample program in C
Other than the default standard input, output and error, you must explicitly open files in order to read or write them. There are two system calls for this, open and creat [sic].
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UNIX read and write system calls sample program in C
Input and output uses the read and write system calls, which are accessed from C programs through two functions called read and write. For both, the first argument is a file descri
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malloc, calloc - Storage Management - in C
The functions malloc and calloc obtain blocks of memory dynamically.
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fgets(), fputs() - Line Input and Output - sample program in C
fgets reads the next input line (including the newline) from file fp into the character array line; at most maxline-1 characters will be read. The resulting line is terminated with
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Error Handling - Stderr and Exit - sample program in C
The treatment of errors in cat is not ideal. The trouble is that if one of the files can't be accessed for some reason, the diagnostic is printed at the end of the concatenated out
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