diff options
Diffstat (limited to 'mysys/getvar.c')
| -rw-r--r-- | mysys/getvar.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/mysys/getvar.c b/mysys/getvar.c new file mode 100644 index 00000000000..1d452002490 --- /dev/null +++ b/mysys/getvar.c @@ -0,0 +1,105 @@ +/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + MA 02111-1307, USA */ + +/* Allow use of the -O variable= option to set long variables */ + +#include "mysys_priv.h" +#include <m_string.h> +#include <m_ctype.h> + + /* set all changeable variables */ + +void set_all_changeable_vars(CHANGEABLE_VAR *vars) +{ + for ( ; vars->name ; vars++) + *vars->varptr= vars->def_value; +} + + +my_bool set_changeable_varval(const char* var, ulong val, + CHANGEABLE_VAR *vars) +{ + char buffer[256]; + sprintf( buffer, "%s=%lu", var, (unsigned long) val ); + return set_changeable_var( buffer, vars ); +} + + +my_bool set_changeable_var(my_string str,CHANGEABLE_VAR *vars) +{ + char endchar; + my_string end; + DBUG_ENTER("set_changeable_var"); + DBUG_PRINT("enter",("%s",str)); + + if (str) + { + if (!(end=strchr(str,'='))) + fprintf(stderr,"Can't find '=' in expression '%s' to option -O\n",str); + else + { + uint length=(uint) (end-str),found_count=0; + CHANGEABLE_VAR *var,*found; + const char *name; + long num; + + for (var=vars,found=0 ; (name=var->name) ; var++) + { + if (!my_casecmp(name,str,length)) + { + found=var; found_count++; + if (!name[length]) + { + found_count=1; + break; + } + } + } + if (found_count == 0) + { + fprintf(stderr,"No variable match for: -O '%s'\n",str); + DBUG_RETURN(1); + } + if (found_count > 1) + { + fprintf(stderr,"Variable prefix '%*s' is not unique\n",length,str); + DBUG_RETURN(1); + } + + num=(long) atol(end+1); endchar=strend(end+1)[-1]; + if (endchar == 'k' || endchar == 'K') + num*=1024; + else if (endchar == 'm' || endchar == 'M') + num*=1024L*1024L; + else if (!isdigit(endchar)) + { + fprintf(stderr,"Unknown prefix used for variable value '%s'\n",str); + DBUG_RETURN(1); + } + if (num < (long) found->min_value) + num=(long) found->min_value; + else if ((unsigned long) num > + (unsigned long) found->max_value) + num=(long) found->max_value; + *found->varptr=(long) ((ulong) (num-found->sub_size) / + (ulong) found->block_size); + (*found->varptr)*= (ulong) found->block_size; + DBUG_RETURN(0); + } + } + DBUG_RETURN(1); +} |