diff options
Diffstat (limited to 'xmalloc.c')
| -rw-r--r-- | xmalloc.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/xmalloc.c b/xmalloc.c new file mode 100644 index 0000000..1b3b408 --- /dev/null +++ b/xmalloc.c @@ -0,0 +1,225 @@ +/* xmalloc.c -- safe versions of malloc and realloc */ + +/* Copyright (C) 1991-2016 Free Software Foundation, Inc. + + This file is part of GNU Bash, the GNU Bourne Again SHell. + + Bash 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 3 of the License, or + (at your option) any later version. + + Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>. +*/ + +#if defined (HAVE_CONFIG_H) +#include <config.h> +#endif + +#include "bashtypes.h" +#include <stdio.h> + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif + +#if defined (HAVE_STDLIB_H) +# include <stdlib.h> +#else +# include "ansi_stdlib.h" +#endif /* HAVE_STDLIB_H */ + +#include "error.h" + +#include "bashintl.h" + +#if !defined (PTR_T) +# if defined (__STDC__) +# define PTR_T void * +# else +# define PTR_T char * +# endif /* !__STDC__ */ +#endif /* !PTR_T */ + +#if HAVE_SBRK && !HAVE_DECL_SBRK +extern char *sbrk(); +#endif + +#if HAVE_SBRK && defined (USING_BASH_MALLOC) +static PTR_T lbreak; +static int brkfound; +static size_t allocated; +#endif + +/* **************************************************************** */ +/* */ +/* Memory Allocation and Deallocation. */ +/* */ +/* **************************************************************** */ + +#if HAVE_SBRK && defined (USING_BASH_MALLOC) +#define FINDBRK() \ +do { \ + if (brkfound == 0) \ + { \ + lbreak = (PTR_T)sbrk (0); \ + brkfound++; \ + } \ +} while (0) + +static size_t +findbrk () +{ + FINDBRK(); + return (char *)sbrk (0) - (char *)lbreak; +} +#else +#define FINDBRK() +#endif + +static void +allocerr (func, bytes) + const char *func; + size_t bytes; +{ +#if HAVE_SBRK && defined (USING_BASH_MALLOC) + allocated = findbrk (); + fatal_error (_("%s: cannot allocate %lu bytes (%lu bytes allocated)"), func, (unsigned long)bytes, (unsigned long)allocated); +#else + fatal_error (_("%s: cannot allocate %lu bytes"), func, (unsigned long)bytes); +#endif /* !HAVE_SBRK */ +} + +/* Return a pointer to free()able block of memory large enough + to hold BYTES number of bytes. If the memory cannot be allocated, + print an error message and abort. */ +PTR_T +xmalloc (bytes) + size_t bytes; +{ + PTR_T temp; + +#if defined (DEBUG) + if (bytes == 0) + internal_warning("xmalloc: size argument is 0"); +#endif + + FINDBRK(); + temp = malloc (bytes); + + if (temp == 0) + allocerr ("xmalloc", bytes); + + return (temp); +} + +PTR_T +xrealloc (pointer, bytes) + PTR_T pointer; + size_t bytes; +{ + PTR_T temp; + +#if defined (DEBUG) + if (bytes == 0) + internal_warning("xrealloc: size argument is 0"); +#endif + + FINDBRK(); + temp = pointer ? realloc (pointer, bytes) : malloc (bytes); + + if (temp == 0) + allocerr ("xrealloc", bytes); + + return (temp); +} + +/* Use this as the function to call when adding unwind protects so we + don't need to know what free() returns. */ +void +xfree (string) + PTR_T string; +{ + if (string) + free (string); +} + +#ifdef USING_BASH_MALLOC +#include <malloc/shmalloc.h> + +static void +sh_allocerr (func, bytes, file, line) + const char *func; + size_t bytes; + char *file; + int line; +{ +#if HAVE_SBRK + allocated = findbrk (); + fatal_error (_("%s: %s:%d: cannot allocate %lu bytes (%lu bytes allocated)"), func, file, line, (unsigned long)bytes, (unsigned long)allocated); +#else + fatal_error (_("%s: %s:%d: cannot allocate %lu bytes"), func, file, line, (unsigned long)bytes); +#endif /* !HAVE_SBRK */ +} + +PTR_T +sh_xmalloc (bytes, file, line) + size_t bytes; + char *file; + int line; +{ + PTR_T temp; + +#if defined (DEBUG) + if (bytes == 0) + internal_warning("xmalloc: %s:%d: size argument is 0", file, line); +#endif + + FINDBRK(); + temp = sh_malloc (bytes, file, line); + + if (temp == 0) + sh_allocerr ("xmalloc", bytes, file, line); + + return (temp); +} + +PTR_T +sh_xrealloc (pointer, bytes, file, line) + PTR_T pointer; + size_t bytes; + char *file; + int line; +{ + PTR_T temp; + +#if defined (DEBUG) + if (bytes == 0) + internal_warning("xrealloc: %s:%d: size argument is 0", file, line); +#endif + + FINDBRK(); + temp = pointer ? sh_realloc (pointer, bytes, file, line) : sh_malloc (bytes, file, line); + + if (temp == 0) + sh_allocerr ("xrealloc", bytes, file, line); + + return (temp); +} + +void +sh_xfree (string, file, line) + PTR_T string; + char *file; + int line; +{ + if (string) + sh_free (string, file, line); +} +#endif |