+++ /dev/null
-/* -*-c-*-
- *
- * $Id: utils.c,v 1.6 1998/01/12 16:46:47 mdw Exp $
- *
- * Miscellaneous useful bits of code.
- *
- * (c) 1998 Mark Wooding
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of `become'
- *
- * `Become' is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * `Become' is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with `become'; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: utils.c,v $
- * Revision 1.6 1998/01/12 16:46:47 mdw
- * Fix copyright date.
- *
- * Revision 1.5 1997/09/17 10:24:47 mdw
- * Flush output before and after writing memory tracking information.
- *
- * Revision 1.4 1997/09/08 13:43:54 mdw
- * Flush tracedump file after each `interesting' write.
- *
- * Revision 1.3 1997/08/20 16:25:37 mdw
- * Add some simple `malloc' tracking.
- *
- * Revision 1.2 1997/08/04 10:24:26 mdw
- * Sources placed under CVS control.
- *
- * Revision 1.1 1997/07/21 13:47:42 mdw
- * Initial revision
- *
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-/* --- ANSI headers --- */
-
-#include <ctype.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-/* --- Local headers --- */
-
-#include "config.h"
-#include "utils.h"
-
-/*----- Program name handling ---------------------------------------------*/
-
-/* --- Static data --- */
-
-static const char *myname = 0; /* What's my name? */
-
-/* --- @quis@ --- *
- *
- * Arguments: ---
- *
- * Returns: Pointer to the program name.
- *
- * Use: Returns the program name.
- */
-
-const char *quis(void)
-{
- return (myname);
-}
-
-/* --- @ego@ --- *
- *
- * Arguments: @const char *p@ = pointer to program name
- *
- * Returns: ---
- *
- * Use: Tells the utils library what the program's name is.
- */
-
-#ifndef PATHSEP
-# if defined(__riscos)
-# define PATHSEP '.'
-# elif defined(__unix) || defined(unix)
-# define PATHSEP '/'
-# else
-# define PATHSEP '\\'
-# endif
-#endif
-
-void ego(const char *p)
-{
- const char *q = p;
- while (*q) {
- if (*q++ == PATHSEP)
- p = q;
- }
- myname = p;
-}
-
-/*----- Error reporting ---------------------------------------------------*/
-
-/* --- @moan@ --- *
- *
- * Arguments: @const char *f@ = a @printf@-style format string
- * @...@ = other arguments
- *
- * Returns: ---
- *
- * Use: Reports an error.
- */
-
-void moan(const char *f, ...)
-{
- va_list ap;
- va_start(ap, f);
- fprintf(stderr, "%s: ", myname);
- vfprintf(stderr, f, ap);
- va_end(ap);
- putc('\n', stderr);
-}
-
-/* --- @die@ --- *
- *
- * Arguments: @const char *f@ = a @printf@-style format string
- * @...@ = other arguments
- *
- * Returns: Never.
- *
- * Use: Reports an error and hari-kiris. Like @moan@ above, only
- * more permanent.
- */
-
-void die(const char *f, ...)
-{
- va_list ap;
- va_start(ap, f);
- fprintf(stderr, "%s: ", myname);
- vfprintf(stderr, f, ap);
- va_end(ap);
- putc('\n', stderr);
- exit(EXIT_FAILURE);
-}
-
-/*----- Trace messages ----------------------------------------------------*/
-
-#if defined(TRACING) || !defined(NDEBUG)
-
-/* --- Static data --- */
-
-static FILE *tracefp = 0; /* Where does debugging go? */
-static unsigned int tracelvl = 0; /* How much tracing gets done? */
-
-/* --- @trace@ --- *
- *
- * Arguments: @unsigned int lvl@ = trace level for output
- * @const char *f@ = a @printf@-style format string
- * @...@ = other arguments
- *
- * Returns: ---
- *
- * Use: Reports a message to the trace output.
- */
-
-void trace(unsigned int lvl, const char *f, ...)
-{
- va_list ap;
- if ((lvl & tracing()) == 0)
- return;
- va_start(ap, f);
- fprintf(tracefp, "*** %s: ", myname);
- vfprintf(tracefp, f, ap);
- va_end(ap);
- putc('\n', tracefp);
- fflush(tracefp);
-}
-
-/* --- @traceblk@ --- *
- *
- * Arguments: @unsigned int lvl@ = trace level for output
- * @const char *hdr@ = some header string to write
- * @const void *blk@ = pointer to a block of memory to dump
- * @size_t sz@ = size of the block of memory
- *
- * Returns: ---
- *
- * Use: Dumps the contents of a block to the trace output.
- */
-
-void traceblk(unsigned int lvl, const char *hdr, const void *blk, size_t sz)
-{
- const unsigned char *p = blk;
- size_t i;
- unsigned long o = 0;
- size_t c;
-
- /* --- Skip if the trace level is too high --- */
-
- if ((lvl & tracing()) == 0)
- return;
-
- /* --- Now start work --- */
-
- fprintf(tracefp, "*** %s: %s\n", myname, hdr);
-
- while (sz) {
- fprintf(tracefp, "*** %s: %08lu : ", myname, o);
- for (i = 0; i < 8; i++) {
- if (i < sz)
- fprintf(tracefp, "%02x ", p[i]);
- else
- fputs("** ", tracefp);
- }
- fputs(": ", tracefp);
- for (i = 0; i < 8; i++) {
- if (i < sz)
- fputc(isprint(p[i]) ? p[i] : '.', tracefp);
- else
- fputc('*', tracefp);
- }
- fputc('\n', tracefp);
- c = (sz >= 8) ? 8 : sz;
- sz -= c, p += c, o += c;
- }
- fflush(tracefp);
-}
-
-/* --- @traceon@ --- *
- *
- * Arguments: @FILE *fp@ = a file to trace on
- * @unsigned int lvl@ = trace level to set
- *
- * Returns: ---
- *
- * Use: Enables tracing to a file.
- */
-
-void traceon(FILE *fp, unsigned int lvl)
-{
- tracefp = fp;
- if (!tracelvl)
- tracelvl = lvl;
-}
-
-/* --- @tracesetlvl@ --- *
- *
- * Arguments: @unsigned int lvl@ = trace level to set
- *
- * Returns: ---
- *
- * Use: Sets the tracing level.
- */
-
-void tracesetlvl(unsigned int lvl) { tracelvl = lvl; }
-
-/* --- @tracing@ --- *
- *
- * Arguments: ---
- *
- * Returns: Zero if not tracing, tracing level if tracing.
- *
- * Use: Informs the caller whether tracing is enabled.
- */
-
-unsigned int tracing(void) { return (tracefp ? tracelvl : 0u); }
-
-#endif
-
-/*----- Memory management functions ---------------------------------------*/
-
-/* --- @xmalloc@ --- *
- *
- * Arguments: @size_t sz@ = size of block to allocate
- *
- * Returns: Pointer to allocated block.
- *
- * Use: Allocates memory. If the memory isn't available, we don't
- * hang aroung long enough for a normal function return.
- */
-
-void *xmalloc(size_t sz)
-{
- void *p = malloc(sz);
- if (!p)
- die("not enough memory");
- return (p);
-}
-
-/* --- @xstrdup@ --- *
- *
- * Arguments: @const char *s@ = pointer to a string
- *
- * Returns: Pointer to a copy of the string.
- *
- * Use: Copies a string (like @strdup@ would, if it existed).
- */
-
-char *xstrdup(const char *s)
-{
- size_t sz = strlen(s) + 1;
- char *p = xmalloc(sz);
- memcpy(p, s, sz);
- return (p);
-}
-
-/* --- @xrealloc@ --- *
- *
- * Arguments: @void *p@ = pointer to a block of memory
- * @size_t sz@ = new size desired for the block
- *
- * Returns: Pointer to the resized memory block (which is almost
- * certainly not in the same place any more).
- *
- * Use: Resizes a memory block.
- */
-
-void *xrealloc(void *p, size_t sz)
-{
- p = realloc(p, sz);
- if (!p)
- die("not enough memory");
- return (p);
-}
-
-/*----- Simple memory use tracking ----------------------------------------*/
-
-#ifdef TRACK_MALLOC
-
-/*#define TRACK_VERBOSE*/
-
-/* --- A type to record a size and have a nice alignment --- */
-
-typedef union szblock {
- struct {
- union szblock *next;
- union szblock *prev;
- size_t sz;
- } x;
- long double _ld;
- void *_p;
-} szblock;
-
-/* --- Static data --- */
-
-static unsigned int memused = 0;
-static szblock *memlist;
-
-/* --- @track_malloc@ --- *
- *
- * Arguments: @size_t sz@ = size requested
- *
- * Returns: Pointer to allocated space, or null
- *
- * Use: Allocates memory, and tracks how much is allocated.
- */
-
-void *track_malloc(size_t sz)
-{
- szblock *q = (malloc)(sz + sizeof(szblock));
- if (q) {
- memused += sz;
-#ifdef TRACK_VERBOSE
- fflush(0);
- printf("[%p] allocated %lu\n", (void *)(q + 1), (unsigned long)sz);
- fflush(stdout);
-#endif
- q->x.sz = sz;
- q->x.next = memlist;
- q->x.prev = 0;
- if (q->x.next)
- q->x.next->x.prev = q;
- memlist = q;
- return (q + 1);
- }
- return (0);
-}
-
-/* --- @track_free@ --- *
- *
- * Arguments: @void *p@ = pointer to an allocated block
- *
- * Returns: ---
- *
- * Use: Frees memory, and tracks how much is still allocated.
- */
-
-void track_free(void *p)
-{
- szblock *q;
-
- if (!p)
- return;
- q = (szblock *)p - 1;
-#ifdef TRACK_VERBOSE
- fflush(0);
- printf("[%p] freed %lu\n", (void *)(q + 1), (unsigned long)q->x.sz);
- fflush(stdout);
-#endif
- if (q->x.next)
- q->x.next->x.prev = q->x.prev;
- if (q->x.prev)
- q->x.prev->x.next = q->x.next;
- else
- memlist = q->x.next;
- memused -= q->x.sz;
- (free)(q);
-}
-
-/* --- @track_realloc@ --- *
- *
- * Arguments: @void *p@ = pointer to an allocated block
- * @size_t sz@ = how big it wants to be
- *
- * Returns: Pointer to the new block.
- *
- * Use: Reallocates a block, tracking how much memory is still
- * available.
- */
-
-void *track_realloc(void *p, size_t sz)
-{
- size_t osz;
- szblock *q, *qq;
- if (p) {
- q = (szblock *)p - 1;
- osz = q->x.sz;
- if (q->x.next)
- q->x.next->x.prev = q->x.prev;
- if (q->x.prev)
- q->x.prev->x.next = q->x.next;
- else
- memlist = q->x.next;
- } else {
- q = 0;
- osz = 0;
- }
- qq = (realloc)(q, sz + sizeof(szblock));
- if (qq) {
-#ifdef TRACK_VERBOSE
- fflush(0);
- printf("[%p->%p] reallocated %lu -> %lu\n",
- (void *)(q + 1), (void *)(qq + 1),
- (unsigned long)osz, (unsigned long)sz);
- fflush(stdout);
-#endif
- qq->x.sz = sz;
- qq->x.next = memlist;
- qq->x.prev = 0;
- if (qq->x.next)
- qq->x.next->x.prev = qq;
- memlist = qq;
- memused += sz - osz;
- qq->x.sz = sz;
- return (qq + 1);
- }
- return (0);
-}
-
-/* --- @track_memused@ --- *
- *
- * Arguments: ---
- *
- * Returns: A count of how much memory is used currently.
- *
- * Use: Returns the amount of memory which the @track_@-functions
- * above have counted as being currently allocated.
- */
-
-unsigned long track_memused(void)
-{
- return (memused);
-}
-
-/* --- @track_memlist@ --- *
- *
- * Arguments: ---
- *
- * Returns: ---
- *
- * Use: Dumps a list of allocated blocks to standard output.
- */
-
-void track_memlist(void)
-{
- szblock *q = memlist;
- fflush(0);
- printf("listing blocks:\n");
- while (q) {
- printf("... [%p] %lu\n", (void *)(q + 1), (unsigned long)q->x.sz);
- q = q->x.next;
- }
- printf("done\n");
- fflush(stdout);
-}
-
-#endif
-
-/*----- That's all, folks -------------------------------------------------*/
~mdw / become / blobdiff