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/* safe.c */
/* Copyright 1995 by Steve Kirkendall */
#include "elvis.h"
#ifdef FEATURE_RCSID
char id_safe[] = "$Id: safe.c,v 2.17 2003/10/17 17:41:23 steve Exp $";
#endif
#ifndef DEBUG_ALLOC
void *safealloc(qty, size)
int qty; /* number of items to allocate */
size_t size; /* size of each item */
{
void *newp;
newp = (void *)calloc((size_t)qty, size);
if (!newp)
{
msg(MSG_FATAL, "no memory");
}
return newp;
}
void safefree(ptr)
void *ptr; /* pointer to item(s) to be freed */
{
free(ptr);
}
char *safedup(str)
char *str; /* nul-terminated string to be duplicated */
{
char *newp = (char *)safealloc((int)strlen(str) + 1, sizeof(char));
strcpy(newp, str);
return newp;
}
#else
#define MAGIC1 0x10d934a2
#define MAGIC2 0x42df3219
typedef struct sainfo_s
{
struct sainfo_s *next; /* another allocated memory chunk */
char *file; /* source file where allocated */
int line; /* source line where allocated */
int size; /* number of longs allocated */
ELVBOOL kept; /* if ElvTrue, don't complain if never freed */
long magic[2];/* magic number plus application info */
} sainfo_t;
sainfo_t *allocated;
/* inspect the list of allocated memory */
void safeinspect()
{
sainfo_t *scan;
/* inspect list of allocated blocks for overflow/underflow */
for (scan = allocated; scan; scan = scan->next)
{
if (scan->magic[0] != MAGIC1)
{
fprintf(stderr, "underflow in memory at 0x%lx, allocated from %s:%d, magic[0]=0x%lx\n",
(long)scan, scan->file, scan->line, scan->magic[0]);
abort();
}
else if (scan->magic[scan->size + 1] != MAGIC2)
{
fprintf(stderr, "overflow in memory at 0x%lx, allocated from %s:%d, magic[%d]=0x%lx\n",
(long)scan, scan->file, scan->line, scan->size+1, scan->magic[scan->size + 1]);
abort();
}
}
}
/* allocate memory, and remember where it was allocated */
void *_safealloc(file, line, kept, qty, size)
char *file; /* name of source file where this func was called */
int line; /* line of source file where this func was called */
ELVBOOL kept; /* if ElvTrue, don't complain if never allocated */
int qty; /* number of items to allocate */
size_t size; /* size of each item */
{
int nlongs;
sainfo_t *newp, *scan, *lag;
/* inspect previous allocations */
safeinspect();
/* round user request up to whole number of longs */
nlongs = (qty * size + sizeof(long) - 1) / sizeof(long);
assert(nlongs * sizeof(long) >= qty * size);
/* allocate storage space */
newp = (sainfo_t *)calloc(1, sizeof(sainfo_t) + nlongs * sizeof(long));
if (!newp)
{
msg(MSG_FATAL, "no memory");
}
/* save info about allocated memory */
newp->file = file;
newp->line = line;
newp->size = nlongs;
newp->kept = kept;
newp->magic[0] = MAGIC1;
newp->magic[1 + newp->size] = MAGIC2;
for (scan = allocated, lag = NULL;
scan && (strcmp(file, scan->file) < 0 || (!strcmp(file, scan->file) && line < scan->line));
lag = scan, scan = scan->next)
{
}
newp->next = scan;
if (lag)
lag->next = newp;
else
allocated = newp;
/* count allocations from that spot */
for (nlongs = 0, scan = newp;
scan && !strcmp(file, scan->file) && line == scan->line;
nlongs++, scan = scan->next)
{
}
if (nlongs > 100 && (!kept || strcmp(file, "options.c")))
{
fprintf(stderr, "%d allocations from %s(%d)\n", nlongs, file, line);
}
/* return the application portion of allocated memory */
return (void *)&newp->magic[1];
}
/* free allocated memory */
void _safefree(file, line, mem)
char *file; /* name of source file where this func was called */
int line; /* line of source file where this func was called */
void *mem; /* item(s) to be freed */
{
sainfo_t *scan, *lag;
/* inspect previous allocations */
safeinspect();
/* locate the memory in the allocated list */
for (lag = NULL, scan = allocated;
scan && (void *)&scan->magic[1] != mem;
lag = scan, scan = scan->next)
{
}
/* if not in allocation list, fail */
if (!scan)
{
fprintf(stderr, "attempt to free unallocated memory from %s:%ld\n",
file, (long)line);
return;
}
/* delete the memory from the allocated list */
if (lag)
{
lag->next = scan->next;
}
else
{
allocated = scan->next;
}
/* free the memory */
free(scan);
}
/* allocate a duplicate of a string, using _safealloc() */
char *_safedup(file, line, kept, str)
char *file; /* name of source file where this func was called */
int line; /* line of source file where this func was called */
ELVBOOL kept; /* if ElvTrue, don't complain if never freed */
char *str; /* nul-terminated string to duplicate */
{
char *newp;
newp = (char *)_safealloc(file, line, kept, (int)(strlen(str) + 1), sizeof(char));
strcpy(newp, str);
return newp;
}
/* list any unfreed memory */
void safeterm()
{
sainfo_t *scan;
for (scan = allocated; scan; scan = scan->next)
{
if (!scan->kept)
{
fprintf(stderr, "memory allocated from %s:%ld never freed\n",
scan->file, (long)scan->line);
}
}
}
#endif
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