The result buffer must be large enough to hold the result string

Posted on 2002-06-29
Last Modified: 2010-08-05
This program is generating error since I am not able to set/increase the buffer size of the resulting string.
For complete refernce to this problem plz refer to the comments and my previous question
"06/27/02 100 Replace single doublequotes with double doublequot... "

The result buffer must be large enough to hold the result string. The result
string will be at least at strlen(src) + 2 (for the start and end double
quotes), and can be larger if there are double quotes which must be converted into 2
double quote escapes.

char *
DoubleQuotedStringWrite(char* result, char* src)
  char* dest = result;
  *dest++ = '\"'; // write the starting double quote
/* strcpy() the src into the dest, expanding any double  
   quotes into 2 double quote escape sequences.*/
    for(char* psrc = src ; *psrc ; ++psrc) {
       *dest++ = *psrc;
       if(*psrc == '"') {
         // write another " to make it a 2 double quote
          escape sequence
        *dest++ = *psrc;
    *dest = '\"'; // write the ending double quote
Question by:manbirpahwa
LVL 32

Expert Comment

ID: 7118256
>>since I am not able to set/increase the buffer size of
>>the resulting string.


Do you NOT know how? (We can help here.)

Do you have broken fingers and can't type the code? (Can't help much...  See a doctor.)


Accepted Solution

Levant earned 100 total points
ID: 7119604
Use the following function to calculate the resulting buffer size:

int BufferSize(char *src)
   int num = 0;   // holds number of double quotes

   for(char *ptr = src; *ptr; ptr++)
      if(*ptr == '\"')

   return(strlen(src) + num + 1);

Then in order to execute the DoubleQuotedStringWrite correctly use:

int size = BufferSize(str);
char *result = (char *)malloc(size);
DoubleQuotedStringWrite(result, str);

Now result contains just enough space.

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