145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/* $Source: /u/mark/src/pax/RCS/mem.c,v $
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*
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* $Revision: 1.2 $
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*
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* mem.c - memory allocation and manipulation functions
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*
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* DESCRIPTION
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*
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* These routines are provided for higher level handling of the UNIX
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* memory allocation functions.
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*
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* AUTHOR
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*
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* Mark H. Colburn, NAPS International (mark@jhereg.mn.org)
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*
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*
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* Sponsored by The USENIX Association for public distribution.
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*
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* Copyright (c) 1989 Mark H. Colburn.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice is duplicated in all such
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* forms and that any documentation, advertising materials, and other
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* materials related to such distribution and use acknowledge that the
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* software was developed * by Mark H. Colburn and sponsored by The
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* USENIX Association.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Log: mem.c,v $
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* Revision 1.2 89/02/12 10:04:53 mark
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* 1.2 release fixes
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*
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* Revision 1.1 88/12/23 18:02:17 mark
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* Initial revision
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*
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*/
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#ifndef lint
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static char *ident = "$Id: mem.c,v 1.2 89/02/12 10:04:53 mark Exp $";
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static char *copyright = "Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.\n";
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#endif /* ! lint */
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/* Headers */
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#include "pax.h"
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/* mem_get - allocate memory
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*
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* DESCRIPTION
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*
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* Mem_get attempts to allocate a block of memory using the malloc
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* function call. In the event that the memory is not available,
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* mem_get will display an "Out of memory" message for the user
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* the first time it encounters the an out of memory situation.
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* Subsequent calls to mem_get may fail, but no message will be
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* printed.
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*
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* PARAMETERS
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*
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* uint len - The amount of memory to allocate
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*
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* RETURNS
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*
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* Normally returns the pointer to the newly allocated memory. If
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* an error occurs, NULL is returned, and an error message is
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* printed.
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*
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* ERRORS
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*
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* ENOMEM No memory is available
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*/
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#ifdef __STDC__
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char *mem_get(uint len)
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#else
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char *mem_get(len)
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uint len; /* amount of memory to get */
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#endif
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{
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char *mem;
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static short outofmem = 0;
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#ifdef DF_TRACE_DEBUG
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printf("DF_TRACE_DEBUG: char *mem_get() in mem.c\n");
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#endif
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if ((mem = (char *)malloc(len)) == (char *)NULL && !outofmem) {
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outofmem++;
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warn("mem_get()", "Out of memory");
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}
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return (mem);
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}
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/* mem_str - duplicate a string into dynamic memory
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*
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* DESCRIPTION
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*
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* Mem_str attempts to make a copy of string. It allocates space for
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* the string, and if the allocation was successfull, copies the old
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* string into the newly allocated space.
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*
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* PARAMETERS
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*
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* char *str - string to make a copy of
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*
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* RETURNS
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*
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* Normally returns a pointer to a new string at least as large
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* as strlen(str) + 1, which contains a copy of the the data
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* passed in str, plus a null terminator. Returns (char *)NULL
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* if enough memory to make a copy of str is not available.
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*/
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#ifdef __STDC__
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char *mem_str(char *str)
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#else
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char *mem_str(str)
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char *str; /* string to make a copy of */
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#endif
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{
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char *mem;
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#ifdef DF_TRACE_DEBUG
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printf("DF_TRACE_DEBUG: char *mem_str() in mem.c\n");
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#endif
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if (mem = mem_get((uint) strlen(str) + 1)) {
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strcpy(mem, str);
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}
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return (mem);
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}
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