1 /* Check system header files for ISO 9899:1990 (ISO C) compliance.
2 Copyright (C) 1996, 1997, 1998, 1999, 2001 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jens Schweikhardt <schweikh@noc.dfn.de>, 1996.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License
8 as published by the Free Software Foundation; either version 2 of
9 the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be
12 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
13 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, write to the Free Software Foundation, Inc., 59 Temple Place -
19 Suite 330, Boston, MA 02111-1307, USA. */
21 /* This is a simple minded program that tries to find illegal macro
22 definitions in system header files. Illegal macro definitions are
23 those not from the implementation namespace (i.e. not starting with
24 an underscore) or not matching any identifier mandated by The
25 Standard. Some common macro names are considered okay, e.g. all those
26 beginning with E (which may be defined in <errno.h>) or ending in
27 _MAX. See the arrays prefix[] and suffix[] below for details.
29 In a compliant implementation no other macros can be defined, because
30 you could write strictly conforming programs that may fail to compile
31 due to syntax errors: suppose <stdio.h> defines PIPE_BUF, then the
35 #include <stdio.h> <- or where the bogus macro is defined
38 #define XSTR(x) STR(x)
42 assert (strcmp ("PIPE_BUF", XSTR (PIPE_BUF)) == 0);
46 is expected to compile and meet the assertion. If it does not, your
47 compiler compiles some other language than Standard C.
50 This program calls gcc to get the list of defined macros. If you
51 don't have gcc you're probably out of luck unless your compiler or
52 preprocessor has something similar to gcc's -dM option. Tune
53 PRINT_MACROS in this case. This program assumes headers are found
54 under /usr/include and that there is a writable /tmp directory.
55 Tune SYSTEM_INCLUDE if your system differs.
56 #define BROKEN_SYSTEM if system(NULL) bombs -- one more violation
60 Each header file name is printed, followed by illegal macro names
61 and their definition. For the above example, you would see
66 If your implementation does not yet incorporate Amendment 1 you
67 will see messages about iso646.h, wctype.h and wchar.h not being
71 # define _GNU_SOURCE 1
78 #define HEADER_MAX 256
80 static const char *macrofile;
82 /* ISO C header names including Amendment 1 (without ".h" suffix). */
83 static char *header[] =
85 "assert", "ctype", "errno", "float", "iso646", "limits", "locale",
86 "math", "setjmp", "signal", "stdarg", "stddef", "stdio", "stdlib",
87 "string", "time", "wchar", "wctype"
90 /* Macros with these prefixes are considered okay. */
91 static char *prefix[] =
93 "_", "E", "is", "str", "mem", "SIG", "FLT_", "DBL_", "LDBL_",
97 /* Macros with these suffixes are considered okay. Will not work for
98 parametrized macros with arguments. */
99 static char *suffix[] =
104 /* These macros are considered okay. In fact, these are just more prefixes. */
105 static char *macros[] =
107 "BUFSIZ", "CHAR_BIT", "CHAR_MAX", "CHAR_MIN", "CLOCKS_PER_SEC",
108 "DBL_DIG", "DBL_EPSILON", "DBL_MANT_DIG", "DBL_MAX",
109 "DBL_MAX_10_EXP", "DBL_MAX_EXP", "DBL_MIN", "DBL_MIN_10_EXP",
110 "DBL_MIN_EXP", "EDOM", "EILSEQ", "EOF", "ERANGE", "EXIT_FAILURE",
111 "EXIT_SUCCESS", "FILENAME_MAX", "FLT_DIG", "FLT_EPSILON",
112 "FLT_MANT_DIG", "FLT_MAX", "FLT_MAX_10_EXP", "FLT_MAX_EXP",
113 "FLT_MIN", "FLT_MIN_10_EXP", "FLT_MIN_EXP", "FLT_RADIX",
114 "FLT_ROUNDS", "FOPEN_MAX", "HUGE_VAL", "INT_MAX", "INT_MIN",
115 "LC_ALL", "LC_COLLATE", "LC_CTYPE", "LC_MONETARY", "LC_NUMERIC",
116 "LC_TIME", "LDBL_DIG", "LDBL_EPSILON", "LDBL_MANT_DIG", "LDBL_MAX",
117 "LDBL_MAX_10_EXP", "LDBL_MAX_EXP", "LDBL_MIN", "LDBL_MIN_10_EXP",
118 "LDBL_MIN_EXP", "LONG_MAX", "LONG_MIN", "L_tmpnam", "MB_CUR_MAX",
119 "MB_LEN_MAX", "NDEBUG", "NULL", "RAND_MAX", "SCHAR_MAX",
120 "SCHAR_MIN", "SEEK_CUR", "SEEK_END", "SEEK_SET", "SHRT_MAX",
121 "SHRT_MIN", "SIGABRT", "SIGFPE", "SIGILL", "SIGINT", "SIGSEGV",
122 "SIGTERM", "SIG_DFL", "SIG_ERR", "SIG_IGN", "TMP_MAX", "UCHAR_MAX",
123 "UINT_MAX", "ULONG_MAX", "USHRT_MAX", "WCHAR_MAX", "WCHAR_MIN",
124 "WEOF", "_IOFBF", "_IOLBF", "_IONBF", "abort", "abs", "acos",
125 "acosf", "acosl", "and", "and_eq", "asctime", "asin", "asinf",
126 "asinl", "assert", "atan", "atan2", "atan2f", "atan2l", "atanf",
127 "atanl", "atexit", "atof", "atoi", "atol", "bitand", "bitor",
128 "bsearch", "btowc", "calloc", "ceil", "ceilf", "ceill", "clearerr",
129 "clock", "clock_t", "compl", "cos", "cosf", "cosh", "coshf",
130 "coshl", "cosl", "ctime", "difftime", "div", "div_t", "errno",
131 "exit", "exp", "expf", "expl", "fabs", "fabsf", "fabsl", "fclose",
132 "feof", "ferror", "fflush", "fgetc", "fgetpos", "fgets", "fgetwc",
133 "fgetws", "floor", "floorf", "floorl", "fmod", "fmodf", "fmodl",
134 "fopen", "fprintf", "fputc", "fputs", "fputwc", "fputws", "fread",
135 "free", "freopen", "frexp", "frexpf", "frexpl", "fscanf", "fseek",
136 "fsetpos", "ftell", "fwide", "fwprintf", "fwrite", "fwscanf",
137 "getc", "getchar", "getenv", "gets", "getwc", "getwchar", "gmtime",
138 "isalnum", "isalpha", "iscntrl", "isdigit", "isgraph", "islower",
139 "isprint", "ispunct", "isspace", "isupper", "iswalnum", "iswalpha",
140 "iswcntrl", "iswctype", "iswdigit", "iswgraph", "iswlower",
141 "iswprint", "iswpunct", "iswspace", "iswupper", "iswxdigit",
142 "isxdigit", "labs", "ldexp", "ldexpf", "ldexpl", "ldiv", "ldiv_t",
143 "localeconv", "localtime", "log", "log10", "log10f", "log10l",
144 "logf", "logl", "longjmp", "malloc", "mblen", "mbrlen", "mbrtowc",
145 "mbsinit", "mbsrtowcs", "mbstate_t", "mbstowcs", "mbtowc", "memchr",
146 "memcmp", "memcpy", "memmove", "memset", "mktime", "modf", "modff",
147 "modfl", "not", "not_eq", "offsetof", "or", "or_eq", "perror",
148 "pow", "powf", "powl", "printf", "ptrdiff_t", "putc", "putchar",
149 "puts", "putwc", "putwchar", "qsort", "raise", "rand", "realloc",
150 "remove", "rename", "rewind", "scanf", "setbuf", "setjmp",
151 "setlocale", "setvbuf", "sig_atomic_t", "signal", "sin", "sinf",
152 "sinh", "sinhf", "sinhl", "sinl", "size_t", "sprintf", "sqrt",
153 "sqrtf", "sqrtl", "srand", "sscanf", "stderr", "stdin", "stdout",
154 "strcat", "strchr", "strcmp", "strcoll", "strcpy", "strcspn",
155 "strerror", "strftime", "strlen", "strncat", "strncmp", "strncpy",
156 "strpbrk", "strrchr", "strspn", "strstr", "strtod", "strtok",
157 "strtol", "strtoul", "strxfrm", "swprintf", "swscanf", "system",
158 "tan", "tanf", "tanh", "tanhf", "tanhl", "tanl", "time", "time_t",
159 "tmpfile", "tmpnam", "tolower", "toupper", "towctrans", "towlower",
160 "towupper", "ungetc", "ungetwc", "va_arg", "va_copy", "va_end", "va_start",
161 "vfprintf", "vfwprintf", "vprintf", "vsprintf", "vswprintf",
162 "vwprintf", "wchar_t", "wcrtomb", "wcscat", "wcschr", "wcscmp",
163 "wcscoll", "wcscpy", "wcscspn", "wcsftime", "wcslen", "wcsncat",
164 "wcsncmp", "wcsncpy", "wcspbrk", "wcsrchr", "wcsrtombs", "wcsspn",
165 "wcsstr", "wcstod", "wcstok", "wcstol", "wcstombs", "wcstoul",
166 "wcsxfrm", "wctob", "wctomb", "wctrans", "wctrans_t", "wctype",
167 "wctype_t", "wint_t", "wmemchr", "wmemcmp", "wmemcpy", "wmemmove",
168 "wmemset", "wprintf", "wscanf", "xor", "xor_eq"
171 #define NUMBER_OF_HEADERS (sizeof header / sizeof *header)
172 #define NUMBER_OF_PREFIXES (sizeof prefix / sizeof *prefix)
173 #define NUMBER_OF_SUFFIXES (sizeof suffix / sizeof *suffix)
174 #define NUMBER_OF_MACROS (sizeof macros / sizeof *macros)
177 /* Format string to build command to invoke compiler. */
178 static const char fmt[] = "\
179 echo \"#include <%s>\" |\
180 %s -E -dM -ansi -pedantic %s -D_LIBC -D_ISOMAC -I. \
181 -isystem `%s --print-prog-name=include` - 2> /dev/null > %s";
184 /* The compiler we use (given on the command line). */
186 /* The -I parameters for CC to find all headers. */
189 static char *xstrndup (const char *, size_t);
190 static const char **get_null_defines (void);
191 static int check_header (const char *, const char **);
194 main (int argc, char *argv[])
198 const char **ignore_list;
200 CC = argc > 1 ? argv[1] : "gcc";
201 INC = argc > 2 ? argv[2] : "";
203 if (system (NULL) == 0)
205 puts ("Sorry, no command processor.");
209 /* First get list of symbols which are defined by the compiler. */
210 ignore_list = get_null_defines ();
212 fputs ("Tested files:\n", stdout);
214 for (h = 0; h < NUMBER_OF_HEADERS; ++h)
216 char file_name[HEADER_MAX];
217 sprintf (file_name, "%s.h", header[h]);
218 result |= check_header (file_name, ignore_list);
221 /* The test suite should return errors but for now this is not
222 practical. Give a warning and ask the user to correct the bugs. */
228 xstrndup (const char *s, size_t n)
231 char *new = malloc (len + 1);
237 return memcpy (new, s, len);
242 get_null_defines (void)
244 char line[BUFSIZ], *command;
245 char **result = NULL;
246 size_t result_len = 0;
247 size_t result_max = 0;
251 macrofile = tmpnam (NULL);
253 command = malloc (sizeof fmt + sizeof "/dev/null" + 2 * strlen (CC)
254 + strlen (INC) + strlen (macrofile));
258 puts ("No more memory.");
262 sprintf (command, fmt, "/dev/null", CC, INC, CC, macrofile);
264 if (system (command))
266 puts ("system() returned nonzero");
270 input = fopen (macrofile, "r");
274 printf ("Could not read %s: ", macrofile);
279 while (fgets (line, sizeof line, input) != NULL)
284 if (strlen (line) < 9 || line[7] != ' ')
286 printf ("Malformed input, expected '#define MACRO'\ngot '%s'\n",
291 /* It's a safe identifier. */
293 if (result_len == result_max)
296 result = realloc (result, result_max * sizeof (char **));
299 puts ("No more memory.");
304 for (end = start + 1; !isspace (*end) && *end != '\0'; ++end)
306 result[result_len++] = xstrndup (start, end - start);
310 fputs ("The following identifiers will be ignored since the compiler defines them\nby default:\n", stdout);
313 puts (result[result_len - 1]);
315 if (result_len == result_max)
318 result = realloc (result, result_max * sizeof (char **));
321 puts ("No more memory.");
325 result[result_len] = NULL;
329 return (const char **) result;
334 check_header (const char *file_name, const char **except)
336 char line[BUFSIZ], *command;
340 command = malloc (sizeof fmt + strlen (file_name) + 2 * strlen (CC)
341 + strlen (INC) + strlen (macrofile));
345 puts ("No more memory.");
350 sprintf (command, fmt, file_name, CC, INC, CC, macrofile);
352 if (system (command))
354 puts ("system() returned nonzero");
358 input = fopen (macrofile, "r");
362 printf ("Could not read %s: ", macrofile);
367 while (fgets (line, sizeof line, input) != NULL)
372 if (strlen (line) < 9 || line[7] != ' ')
374 printf ("Malformed input, expected '#define MACRO'\ngot '%s'\n",
379 for (i = 0; i < NUMBER_OF_PREFIXES; ++i)
381 if (!strncmp (line+8, prefix[i], strlen (prefix[i]))) {
388 for (i = 0; i < NUMBER_OF_MACROS; ++i)
390 if (!strncmp (line + 8, macros[i], strlen (macros[i])))
398 /* Find next char after the macro identifier; this can be either
399 a space or an open parenthesis. */
400 endmac = strcspn (line + 8, " (");
401 if (line[8+endmac] == '\0')
403 printf ("malformed input, expected '#define MACRO VALUE'\n"
408 for (i = 0; i < NUMBER_OF_SUFFIXES; ++i)
410 size_t len = strlen (suffix[i]);
411 if (!strncmp (line + 8 + endmac - len, suffix[i], len))
420 for (cpp = except; *cpp != NULL; ++cpp)
422 size_t len = strlen (*cpp);
423 if (!strncmp (line + 8, *cpp, len) && isspace (line[8 + len]))
431 fputs (line, stdout);