char problem ? Post: 302393786

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Top Forums Programming char problem ? Post 302393786 by cyler on Tuesday 9th of February 2010 02:58:13 PM

02-09-2010

Registered User

char problem ?

Here is a C function that replaces some non-ASCII chars to html decimal entities. It seems that the char "�" does not get replaced correctly but the rest do. Any idea why this is happening ?

(Please note that I had to place a space before each ; or they would not post correctly in this forum because the browser would convert them automatically.)

The function outputs:
Bar&#38 ;#38 ;#38 ;#38 ;#231 ;a
but it should output:
Bar&#231 ;a

Code:

char *conversionpointer = NULL;

char *chartodecimal(const char *STRING) // replaces all occurrences of char to html decimals
{
    conversionpointer = (char *)realloc(conversionpointer, strlen(STRING) + 1);

    strcpy(conversionpointer, STRING);

    char original[15][3] = {        "�",   "\"",    "&",     "�",     "�",     "�",     "�",     "�",     "�",     "�",     "�",     "�",     "�",     "�",     "�"};
    char replacement[15][7] = {"&#231 ;","&#34 ;","&#38 ;","&#241 ;","&#228 ;","&#233 ;","&#235 ;","&#252 ;","&#227 ;","&#186 ;","&#170 ;","&#225 ;","&#243 ;","&#248 ;","&#223 ;"};

    char *conversionpointeroriginalp = NULL;
    char *buffer = NULL;
    int count = 0;

    while(count < 15)
    {
        conversionpointeroriginalp = strstr(conversionpointer, original[count]);

        while(conversionpointeroriginalp != NULL)
        {
            buffer = (char *)realloc(buffer, strlen(conversionpointer) + 1 + (strlen(replacement[count]) - strlen(original[count])));
            strncpy(buffer, conversionpointer, (size_t)(conversionpointeroriginalp - conversionpointer));

            sprintf(buffer + (conversionpointeroriginalp - conversionpointer), "%s%s", replacement[count], conversionpointeroriginalp + strlen(original[count]));

            conversionpointer = (char *)realloc(conversionpointer, strlen(buffer) + 1);

            strcpy(conversionpointer, buffer);

            conversionpointeroriginalp = strstr(conversionpointeroriginalp, original[count]);
        }

        count++;
    }

    if (buffer != NULL)
    {
        free(buffer);
    }

    return conversionpointer;
}

int main(void)
{
    printf("%s\n", chartodecimal("Bar�a"));

    return 0;
}

cyler

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LEARN ABOUT BSD

strncpy

STRING(3)						     Library Functions Manual							 STRING(3)

NAME

       strcat, strncat, strcmp, strncmp, strcasecmp, strncasecmp, strcpy, strncpy, strlen, index, rindex - string operations

SYNOPSIS

       #include <strings.h>

       char *strcat(s, append)
       char *s, *append;

       char *strncat(s, append, count)
       char *s, *append;
       int count;

       strcmp(s1, s2)
       char *s1, *s2;

       strncmp(s1, s2, count)
       char *s1, *s2;
       int count;

       strcasecmp(s1, s2)
       char *s1, *s2;

       strncasecmp(s1, s2, count)
       char *s1, *s2;
       int count;

       char *strcpy(to, from)
       char *to, *from;

       char *strncpy(to, from, count)
       char *to, *from;
       int count;

       strlen(s)
       char *s;

       char *index(s, c)
       char *s, c;

       char *rindex(s, c)
       char *s, c;

DESCRIPTION

       These functions operate on null-terminated strings.  They do not check for overflow of any receiving string.

       Strcat appends a copy of string append to the end of string s. Strncat copies at most count characters.	Both return a pointer to the null-
       terminated result.

       Strcmp compares its arguments and returns an integer greater than, equal to, or less than 0, according as s1 is	lexicographically  greater
       than,  equal to, or less than s2.  Strncmp makes the same comparison but looks at at most count characters.  Strcasecmp and strncasecmp are
       identical in function, but are case insensitive.  The returned lexicographic difference reflects a conversion to lower-case.

       Strcpy copies string from to to, stopping after the null character has been moved.  Strncpy  copies  exactly  count  characters,  appending
       nulls  if from is less than count characters in length; the target may not be null-terminated if the length of from is count or more.  Both
       return to.

       Strlen returns the number of non-null characters in s.

       Index (rindex) returns a pointer to the first (last) occurrence of character c in string s or zero if c does not occur in the string.  Set-
       ting c to NULL works.

4th Berkeley Distribution					 October 22, 1987							 STRING(3)

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