File: mymalloc.c

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/*++
/* NAME
/*	mymalloc 3
/* SUMMARY
/*	memory management wrappers
/* SYNOPSIS
/*	#include <mymalloc.h>
/*
/*	char	*mymalloc(len)
/*	int	len;
/*
/*	char	*myrealloc(ptr, len)
/*	char	*ptr;
/*	int	len;
/*
/*	char	*mystrdup(str)
/*	const char *str;
/* DESCRIPTION
/*	This module performs low-level memory management with error
/*	handling. A call of these functions either succeeds or it does
/*	not return at all.
/*
/*	mymalloc() allocates the requested amount of memory. The memory
/*	is not set to zero.
/*
/*	myrealloc() resizes memory obtained from mymalloc() or myrealloc()
/*	to the requested size. The result pointer value may differ from
/*	that given via the \fBptr\fR argument.
/*
/*	mystrdup() returns a dynamic-memory copy of its null-terminated
/*	argument. This routine uses mymalloc().
/* SEE ALSO
/*	error(3) error reporting module.
/* DIAGNOSTICS
/*	Fatal errors: the requested amount of memory is not available.
/* LICENSE
/*	This software is distributed under the IBM Public License.
/* AUTHOR(S)
/*	Wietse Venema
/*	IBM T.J. Watson Research
/*	P.O. Box 704
/*	Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <stdlib.h>
#include <unistd.h>
#include <string.h>

/* Utility library. */

#include "error.h"
#include "mymalloc.h"

/* mymalloc - allocate memory or bust */

char   *mymalloc(int len)
{
    char   *ptr;

    if ((ptr = malloc(len)) == 0)
	error("Insufficient memory: %m");
    return (ptr);
}

/* myrealloc - reallocate memory or bust */

char   *myrealloc(char *ptr, int len)
{
    if ((ptr = realloc(ptr, len)) == 0)
	error("Insufficient memory: %m");
    return (ptr);
}

/* mystrdup - save string to heap */

char   *mystrdup(const char *str)
{
    return (strcpy(mymalloc(strlen(str) + 1), str));
}