stdlib/fmtmsg.c

   1 /* Copyright (C) 1997-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fmtmsg.h>
  20 #include <libc-lock.h>
  21 #include <stdio.h>
  22 #include <stdint.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/syslog.h>
  26 #include <wchar.h>
  27
  28
  29 /* We have global data, protect the modification.  */
  30 __libc_lock_define_initialized (static, lock)
  31
  32
  33 enum
  34 {
  35   label_mask = 0x01,
  36   severity_mask = 0x02,
  37   text_mask = 0x04,
  38   action_mask = 0x08,
  39   tag_mask = 0x10,
  40   all_mask = label_mask | severity_mask | text_mask | action_mask | tag_mask
  41 };
  42
  43 static const struct
  44 {
  45   uint32_t len;
  46   /* Adjust the size if new elements are added.  */
  47   const char name[12];
  48 } keywords[] =
  49   {
  50     { 5, "label" },
  51     { 8, "severity" },
  52     { 4, "text" },
  53     { 6, "action"},
  54     { 3, "tag" }
  55   };
  56 #define NKEYWORDS (sizeof( keywords) / sizeof (keywords[0]))
  57
  58
  59 struct severity_info
  60 {
  61   int severity;
  62   const char *string;
  63   struct severity_info *next;
  64 };
  65
  66
  67 /* List of known severities.  */
  68 static const struct severity_info nosev =
  69 {
  70   MM_NOSEV, "", NULL
  71 };
  72 static const struct severity_info haltsev =
  73 {
  74   MM_HALT, "HALT", (struct severity_info *) &nosev
  75 };
  76 static const struct severity_info errorsev =
  77 {
  78   MM_ERROR, "ERROR", (struct severity_info *) &haltsev
  79 };
  80 static const struct severity_info warningsev =
  81 {
  82   MM_WARNING, "WARNING", (struct severity_info *) &errorsev
  83 };
  84 static const struct severity_info infosev =
  85 {
  86   MM_INFO, "INFO", (struct severity_info *) &warningsev
  87 };
  88
  89 /* Start of the list.  */
  90 static struct severity_info *severity_list = (struct severity_info *) &infosev;
  91
  92 /* Mask of values we will print.  */
  93 static int print;
  94
  95 /* Prototypes for local functions.  */
  96 static void init (void);
  97 static int internal_addseverity (int severity, const char *string)
  98      internal_function;
  99
 100
 101 int
 102 fmtmsg (long int classification, const char *label, int severity,
 103         const char *text, const char *action, const char *tag)
 104 {
 105   __libc_once_define (static, once);
 106   struct severity_info *severity_rec;
 107
 108   /* Make sure everything is initialized.  */
 109   __libc_once (once, init);
 110
 111   /* Start the real work.  First check whether the input is ok.  */
 112   if (label != MM_NULLLBL)
 113     {
 114       /* Must be two fields, separated by a colon.  */
 115       const char *cp = strchr (label, ':');
 116       if (cp == NULL)
 117         return MM_NOTOK;
 118
 119       /* The first field must not contain more than 10 bytes.  */
 120       if (cp - label > 10
 121           /* The second field must not have more than 14 bytes.  */
 122           || strlen (cp + 1) > 14)
 123         return MM_NOTOK;
 124     }
 125
 126 #ifdef __libc_ptf_call
 127   /* We do not want this call to be cut short by a thread
 128      cancellation.  Therefore disable cancellation for now.  */
 129   int state = PTHREAD_CANCEL_ENABLE;
 130   __libc_ptf_call (__pthread_setcancelstate,
 131                    (PTHREAD_CANCEL_DISABLE, &state), 0);
 132 #endif
 133
 134   __libc_lock_lock (lock);
 135
 136   for (severity_rec = severity_list; severity_rec != NULL;
 137        severity_rec = severity_rec->next)
 138     if (severity == severity_rec->severity)
 139       /* Bingo.  */
 140       break;
 141
 142   /* If we don't know anything about the severity level return an error.  */
 143   int result = MM_NOTOK;
 144   if (severity_rec != NULL)
 145     {
 146       result = MM_OK;
 147
 148       /* Now we can print.  */
 149       if (classification & MM_PRINT)
 150         {
 151           int do_label = (print & label_mask) && label != MM_NULLLBL;
 152           int do_severity = (print & severity_mask) && severity != MM_NULLSEV;
 153           int do_text = (print & text_mask) && text != MM_NULLTXT;
 154           int do_action = (print & action_mask) && action != MM_NULLACT;
 155           int do_tag = (print & tag_mask) && tag != MM_NULLTAG;
 156           int need_colon = (do_label
 157                             && (do_severity | do_text | do_action | do_tag));
 158
 159           if (__fxprintf (stderr, "%s%s%s%s%s%s%s%s%s%s\n",
 160                           do_label ? label : "",
 161                           need_colon ? ": " : "",
 162                           do_severity ? severity_rec->string : "",
 163                           do_severity && (do_text | do_action | do_tag)
 164                           ? ": " : "",
 165                           do_text ? text : "",
 166                           do_text && (do_action | do_tag) ? "\n" : "",
 167                           do_action ? "TO FIX: " : "",
 168                           do_action ? action : "",
 169                           do_action && do_tag ? "  " : "",
 170                           do_tag ? tag : "") < 0)
 171             /* Oh, oh.  An error occurred during the output.  */
 172             result = MM_NOMSG;
 173         }
 174
 175       if (classification & MM_CONSOLE)
 176         {
 177           int do_label = label != MM_NULLLBL;
 178           int do_severity = severity != MM_NULLSEV;
 179           int do_text = text != MM_NULLTXT;
 180           int do_action = action != MM_NULLACT;
 181           int do_tag = tag != MM_NULLTAG;
 182           int need_colon = (do_label
 183                             && (do_severity | do_text | do_action | do_tag));
 184
 185           syslog (LOG_ERR, "%s%s%s%s%s%s%s%s%s%s\n",
 186                   do_label ? label : "",
 187                   need_colon ? ": " : "",
 188                   do_severity ? severity_rec->string : "",
 189                   do_severity && (do_text | do_action | do_tag) ? ": " : "",
 190                   do_text ? text : "",
 191                   do_text && (do_action | do_tag) ? "\n" : "",
 192                   do_action ? "TO FIX: " : "",
 193                   do_action ? action : "",
 194                   do_action && do_tag ? "  " : "",
 195                   do_tag ? tag : "");
 196         }
 197     }
 198
 199   __libc_lock_unlock (lock);
 200
 201 #ifdef __libc_ptf_call
 202   __libc_ptf_call (__pthread_setcancelstate, (state, NULL), 0);
 203 #endif
 204
 205   return result;
 206 }
 207
 208
 209 /* Initialize from environment variable content.  */
 210 static void
 211 init (void)
 212 {
 213   const char *msgverb_var = getenv ("MSGVERB");
 214   const char *sevlevel_var = getenv ("SEV_LEVEL");
 215
 216   if (msgverb_var != NULL && msgverb_var[0] != '\0')
 217     {
 218       /* Using this extra variable allows us to work without locking.  */
 219       do
 220         {
 221           size_t cnt;
 222
 223           for (cnt = 0; cnt < NKEYWORDS; ++cnt)
 224             if (memcmp (msgverb_var,
 225                         keywords[cnt].name, keywords[cnt].len) == 0
 226                 && (msgverb_var[keywords[cnt].len] == ':'
 227                     || msgverb_var[keywords[cnt].len] == '\0'))
 228               break;
 229
 230           if (cnt < NKEYWORDS)
 231             {
 232               print |= 1 << cnt;
 233
 234               msgverb_var += keywords[cnt].len;
 235               if (msgverb_var[0] == ':')
 236                 ++msgverb_var;
 237             }
 238           else
 239             {
 240               /* We found an illegal keyword in the environment
 241                  variable.  The specifications say that we print all
 242                  fields.  */
 243               print = all_mask;
 244               break;
 245             }
 246         }
 247       while (msgverb_var[0] != '\0');
 248     }
 249   else
 250     print = all_mask;
 251
 252
 253   if (sevlevel_var != NULL)
 254     {
 255       __libc_lock_lock (lock);
 256
 257       while (sevlevel_var[0] != '\0')
 258         {
 259           const char *end = __strchrnul (sevlevel_var, ':');
 260           int level;
 261
 262           /* First field: keyword.  This is not used here but it must be
 263              present.  */
 264           while (sevlevel_var < end)
 265             if (*sevlevel_var++ == ',')
 266               break;
 267
 268           if (sevlevel_var < end)
 269             {
 270               /* Second field: severity level, a number.  */
 271               char *cp;
 272
 273               level = strtol (sevlevel_var, &cp, 0);
 274               if (cp != sevlevel_var && cp < end && *cp++ == ','
 275                   && level > MM_INFO)
 276                 {
 277                   const char *new_string;
 278
 279                   new_string = __strndup (cp, end - cp);
 280
 281                   if (new_string != NULL
 282                       && (internal_addseverity (level, new_string)
 283                           != MM_OK))
 284                     free ((char *) new_string);
 285                 }
 286             }
 287
 288           sevlevel_var = end + (*end == ':' ? 1 : 0);
 289         }
 290
 291       __libc_lock_unlock (lock);
 292     }
 293 }
 294
 295
 296 /* Add the new entry to the list.  */
 297 static int
 298 internal_function
 299 internal_addseverity (int severity, const char *string)
 300 {
 301   struct severity_info *runp, *lastp;
 302   int result = MM_OK;
 303
 304   /* First see if there is already a record for the severity level.  */
 305   for (runp = severity_list, lastp = NULL; runp != NULL; runp = runp->next)
 306     if (runp->severity == severity)
 307       break;
 308     else
 309       lastp = runp;
 310
 311   if (runp != NULL)
 312     {
 313       if (string != NULL)
 314         /* Change the string.  */
 315         runp->string = string;
 316       else
 317         {
 318           /* Remove the severity class.  */
 319           if (lastp == NULL)
 320             severity_list = runp->next;
 321           else
 322             lastp->next = runp->next;
 323
 324           free (runp);
 325         }
 326     }
 327   else if (string != NULL)
 328     {
 329       runp = malloc (sizeof (*runp));
 330       if (runp == NULL)
 331         result = MM_NOTOK;
 332       else
 333         {
 334           runp->severity = severity;
 335           runp->next = severity_list;
 336           runp->string = string;
 337           severity_list = runp;
 338         }
 339     }
 340   else
 341     /* We tried to remove a non-existing severity class.  */
 342     result = MM_NOTOK;
 343
 344   return result;
 345 }
 346
 347
 348 /* Add new severity level or remove old one.  */
 349 int
 350 __addseverity (int severity, const char *string)
 351 {
 352   int result;
 353
 354   /* Prevent illegal SEVERITY values.  */
 355   if (severity <= MM_INFO)
 356     return MM_NOTOK;
 357
 358   /* Protect the global data.  */
 359   __libc_lock_lock (lock);
 360
 361   /* Do the real work.  */
 362   result = internal_addseverity (severity, string);
 363
 364   /* Release the lock.  */
 365   __libc_lock_unlock (lock);
 366
 367   return result;
 368 }
 369 weak_alias (__addseverity, addseverity)
 370
 371
 372 libc_freeres_fn (free_mem)
 373 {
 374   struct severity_info *runp = severity_list;
 375
 376   while (runp != NULL)
 377     if (runp->severity > MM_INFO)
 378       {
 379         /* This is data we have to release.  */
 380         struct severity_info *here = runp;
 381         runp = runp->next;
 382         free (here);
 383       }
 384     else
 385       runp = runp->next;
 386 }