diff options
Diffstat (limited to 'mysys/string.c')
| -rw-r--r-- | mysys/string.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/mysys/string.c b/mysys/string.c new file mode 100644 index 00000000000..0aa175e8991 --- /dev/null +++ b/mysys/string.c @@ -0,0 +1,183 @@ +/* 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 */ + +/* + Code for handling strings with can grow dynamicly. + Copyright Monty Program KB. + By monty. +*/ + +#include "mysys_priv.h" +#include <m_string.h> + +my_bool init_dynamic_string(DYNAMIC_STRING *str, const char *init_str, + size_t init_alloc, size_t alloc_increment) +{ + size_t length; + DBUG_ENTER("init_dynamic_string"); + + if (!alloc_increment) + alloc_increment=128; + length=1; + if (init_str && (length= strlen(init_str)+1) < init_alloc) + init_alloc=((length+alloc_increment-1)/alloc_increment)*alloc_increment; + if (!init_alloc) + init_alloc=alloc_increment; + + if (!(str->str=(char*) my_malloc(init_alloc,MYF(MY_WME)))) + DBUG_RETURN(TRUE); + str->length=length-1; + if (init_str) + memcpy(str->str,init_str,length); + str->max_length=init_alloc; + str->alloc_increment=alloc_increment; + DBUG_RETURN(FALSE); +} + + +my_bool dynstr_set(DYNAMIC_STRING *str, const char *init_str) +{ + uint length=0; + DBUG_ENTER("dynstr_set"); + + if (init_str && (length= (uint) strlen(init_str)+1) > str->max_length) + { + str->max_length=((length+str->alloc_increment-1)/str->alloc_increment)* + str->alloc_increment; + if (!str->max_length) + str->max_length=str->alloc_increment; + if (!(str->str=(char*) my_realloc(str->str,str->max_length,MYF(MY_WME)))) + DBUG_RETURN(TRUE); + } + if (init_str) + { + str->length=length-1; + memcpy(str->str,init_str,length); + } + else + str->length=0; + DBUG_RETURN(FALSE); +} + + +my_bool dynstr_realloc(DYNAMIC_STRING *str, size_t additional_size) +{ + DBUG_ENTER("dynstr_realloc"); + + if (!additional_size) DBUG_RETURN(FALSE); + if (str->length + additional_size > str->max_length) + { + str->max_length=((str->length + additional_size+str->alloc_increment-1)/ + str->alloc_increment)*str->alloc_increment; + if (!(str->str=(char*) my_realloc(str->str,str->max_length,MYF(MY_WME)))) + DBUG_RETURN(TRUE); + } + DBUG_RETURN(FALSE); +} + + +my_bool dynstr_append(DYNAMIC_STRING *str, const char *append) +{ + return dynstr_append_mem(str,append,(uint) strlen(append)); +} + + +my_bool dynstr_append_mem(DYNAMIC_STRING *str, const char *append, + size_t length) +{ + char *new_ptr; + DBUG_ENTER("dynstr_append_mem"); + if (str->length+length >= str->max_length) + { + size_t new_length=(str->length+length+str->alloc_increment)/ + str->alloc_increment; + new_length*=str->alloc_increment; + if (!(new_ptr=(char*) my_realloc(str->str,new_length,MYF(MY_WME)))) + DBUG_RETURN(TRUE); + str->str=new_ptr; + str->max_length=new_length; + } + memcpy(str->str + str->length,append,length); + str->length+=length; + str->str[str->length]=0; /* Safety for C programs */ + DBUG_RETURN(FALSE); +} + + +my_bool dynstr_trunc(DYNAMIC_STRING *str, size_t n) +{ + str->length-=n; + str->str[str->length]= '\0'; + return FALSE; +} + +/* + Concatenates any number of strings, escapes any OS quote in the result then + surround the whole affair in another set of quotes which is finally appended + to specified DYNAMIC_STRING. This function is especially useful when + building strings to be executed with the system() function. + + @param str Dynamic String which will have addtional strings appended. + @param append String to be appended. + @param ... Optional. Additional string(s) to be appended. + + @note The final argument in the list must be NullS even if no additional + options are passed. + + @return True = Success. +*/ + +my_bool dynstr_append_os_quoted(DYNAMIC_STRING *str, const char *append, ...) +{ +#ifdef __WIN__ + const char *quote_str= "\""; + const uint quote_len= 1; +#else + const char *quote_str= "\'"; + const uint quote_len= 1; +#endif /* __WIN__ */ + my_bool ret= TRUE; + va_list dirty_text; + + ret&= dynstr_append_mem(str, quote_str, quote_len); /* Leading quote */ + va_start(dirty_text, append); + while (append != NullS) + { + const char *cur_pos= append; + const char *next_pos= cur_pos; + + /* Search for quote in each string and replace with escaped quote */ + while(*(next_pos= strcend(cur_pos, quote_str[0])) != '\0') + { + ret&= dynstr_append_mem(str, cur_pos, (uint) (next_pos - cur_pos)); + ret&= dynstr_append_mem(str ,"\\", 1); + ret&= dynstr_append_mem(str, quote_str, quote_len); + cur_pos= next_pos + 1; + } + ret&= dynstr_append_mem(str, cur_pos, (uint) (next_pos - cur_pos)); + append= va_arg(dirty_text, char *); + } + va_end(dirty_text); + ret&= dynstr_append_mem(str, quote_str, quote_len); /* Trailing quote */ + + return ret; +} + + +void dynstr_free(DYNAMIC_STRING *str) +{ + my_free(str->str); + str->str= NULL; +} |