/* Copyright (C) 2000 MySQL AB This program 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; version 2 of the License. This program 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 this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "mysys_priv.h" #include "mysys_err.h" #include <m_string.h> #include <stdarg.h> #include <m_ctype.h> /* Max length of a error message. Should be kept in sync with MYSQL_ERRMSG_SIZE. */ #define ERRMSGSIZE (512) /* Define some external variables for error handling */ /* WARNING! my_error family functions have to be used according following rules: - if message have not parameters use my_message(ER_CODE, ER(ER_CODE), MYF(N)) - if message registered use my_error(ER_CODE, MYF(N), ...). - With some special text of errror message use: my_printf_error(ER_CODE, format, MYF(N), ...) */ /* Message texts are registered into a linked list of 'my_err_head' structs. Each struct contains (1.) an array of pointers to C character strings with '\0' termination, (2.) the error number for the first message in the array (array index 0) and (3.) the error number for the last message in the array (array index (last - first)). The array may contain gaps with NULL pointers and pointers to empty strings. Both kinds of gaps will be translated to "Unknown error %d.", if my_error() is called with a respective error number. The list of header structs is sorted in increasing order of error numbers. Negative error numbers are allowed. Overlap of error numbers is not allowed. Not registered error numbers will be translated to "Unknown error %d.". */ static struct my_err_head { struct my_err_head *meh_next; /* chain link */ const char **meh_errmsgs; /* error messages array */ int meh_first; /* error number matching array slot 0 */ int meh_last; /* error number matching last slot */ } my_errmsgs_globerrs = {NULL, globerrs, EE_ERROR_FIRST, EE_ERROR_LAST}; static struct my_err_head *my_errmsgs_list= &my_errmsgs_globerrs; /* Error message to user SYNOPSIS my_error() nr Errno MyFlags Flags ... variable list RETURN What (*error_handler_hook)() returns: 0 OK */ int my_error(int nr, myf MyFlags, ...) { const char *format; struct my_err_head *meh_p; va_list args; char ebuff[ERRMSGSIZE]; DBUG_ENTER("my_error"); DBUG_PRINT("my", ("nr: %d MyFlags: %d errno: %d", nr, MyFlags, errno)); /* Search for the error messages array, which could contain the message. */ for (meh_p= my_errmsgs_list; meh_p; meh_p= meh_p->meh_next) if (nr <= meh_p->meh_last) break; /* get the error message string. Default, if NULL or empty string (""). */ if (! (format= (meh_p && (nr >= meh_p->meh_first)) ? meh_p->meh_errmsgs[nr - meh_p->meh_first] : NULL) || ! *format) (void) my_snprintf (ebuff, sizeof(ebuff), "Unknown error %d", nr); else { va_start(args,MyFlags); (void) my_vsnprintf (ebuff, sizeof(ebuff), format, args); va_end(args); } DBUG_RETURN((*error_handler_hook)(nr, ebuff, MyFlags)); } /* Error as printf SYNOPSIS my_printf_error() error Errno format Format string MyFlags Flags ... variable list */ int my_printf_error(uint error, const char *format, myf MyFlags, ...) { va_list args; char ebuff[ERRMSGSIZE]; DBUG_ENTER("my_printf_error"); DBUG_PRINT("my", ("nr: %d MyFlags: %d errno: %d Format: %s", error, MyFlags, errno, format)); va_start(args,MyFlags); (void) my_vsnprintf (ebuff, sizeof(ebuff), format, args); va_end(args); DBUG_RETURN((*error_handler_hook)(error, ebuff, MyFlags)); } /* Give message using error_handler_hook SYNOPSIS my_message() error Errno str Error message MyFlags Flags */ int my_message(uint error, const char *str, register myf MyFlags) { return (*error_handler_hook)(error, str, MyFlags); } /* Register error messages for use with my_error(). SYNOPSIS my_error_register() errmsgs array of pointers to error messages first error number of first message in the array last error number of last message in the array DESCRIPTION The pointer array is expected to contain addresses to NUL-terminated C character strings. The array contains (last - first + 1) pointers. NULL pointers and empty strings ("") are allowed. These will be mapped to "Unknown error" when my_error() is called with a matching error number. This function registers the error numbers 'first' to 'last'. No overlapping with previously registered error numbers is allowed. RETURN 0 OK != 0 Error */ int my_error_register(const char **errmsgs, int first, int last) { struct my_err_head *meh_p; struct my_err_head **search_meh_pp; /* Allocate a new header structure. */ if (! (meh_p= (struct my_err_head*) my_malloc(sizeof(struct my_err_head), MYF(MY_WME)))) return 1; meh_p->meh_errmsgs= errmsgs; meh_p->meh_first= first; meh_p->meh_last= last; /* Search for the right position in the list. */ for (search_meh_pp= &my_errmsgs_list; *search_meh_pp; search_meh_pp= &(*search_meh_pp)->meh_next) { if ((*search_meh_pp)->meh_last > first) break; } /* Error numbers must be unique. No overlapping is allowed. */ if (*search_meh_pp && ((*search_meh_pp)->meh_first <= last)) { my_free((uchar*)meh_p, MYF(0)); return 1; } /* Insert header into the chain. */ meh_p->meh_next= *search_meh_pp; *search_meh_pp= meh_p; return 0; } /* Unregister formerly registered error messages. SYNOPSIS my_error_unregister() first error number of first message last error number of last message DESCRIPTION This function unregisters the error numbers 'first' to 'last'. These must have been previously registered by my_error_register(). 'first' and 'last' must exactly match the registration. If a matching registration is present, the header is removed from the list and the pointer to the error messages pointers array is returned. Otherwise, NULL is returned. RETURN non-NULL OK, returns address of error messages pointers array. NULL Error, no such number range registered. */ const char **my_error_unregister(int first, int last) { struct my_err_head *meh_p; struct my_err_head **search_meh_pp; const char **errmsgs; /* Search for the registration in the list. */ for (search_meh_pp= &my_errmsgs_list; *search_meh_pp; search_meh_pp= &(*search_meh_pp)->meh_next) { if (((*search_meh_pp)->meh_first == first) && ((*search_meh_pp)->meh_last == last)) break; } if (! *search_meh_pp) return NULL; /* Remove header from the chain. */ meh_p= *search_meh_pp; *search_meh_pp= meh_p->meh_next; /* Save the return value and free the header. */ errmsgs= meh_p->meh_errmsgs; my_free((uchar*) meh_p, MYF(0)); return errmsgs; } void my_error_unregister_all(void) { struct my_err_head *cursor, *saved_next; for (cursor= my_errmsgs_globerrs.meh_next; cursor != NULL; cursor= saved_next) { /* We need this ptr, but we're about to free its container, so save it. */ saved_next= cursor->meh_next; my_free((uchar*) cursor, MYF(0)); } my_errmsgs_globerrs.meh_next= NULL; /* Freed in first iteration above. */ my_errmsgs_list= &my_errmsgs_globerrs; }