help to reverse this function

Ok I have a function

Code:

---

int stylecodes(char *input, char *out, int max) {
        int c = 0;
        char *str = input;
        memset(out,'\0',max);
        unsigned int i = 0;
        for (i = 0; i < strlen(input); ) {
                if (strncmp(str,"%c%",3)==0) {
                        snprintf(out,max,"%s%c",out,3);
                        str+=3;
                        c++; i+=3;
                } else if (strncmp(str,"%b%",3)==0) {
                        snprintf(out,max,"%s%c",out,2);
                        str+=3;
                        c++;i+=3;
                } else if (strncmp(str,"%o%",3)==0) {
                        snprintf(out,max,"%s%c",out,15);
                        str+=3;
                        c++;i+=3;
                } else if (strncmp(str,"%u%",3)==0) {
                        snprintf(out,max,"%s%c",out,31);
                        str+=3;
                        c++;i+=3;
                } else if (strncmp(str,"%i%",3)==0) {
                        snprintf(out,max,"%s%c",out,22);
                        str+=3;
                        c++;i+=3;
                } else {
                        snprintf(out,max,"%s%c",out,str[0]);
                        str++;
                        i++;
                }
        }
        return c;
}

---

now I want a fuction, which makes these steps backwards. Lets say the fuction replaces the string %c% with the ascii code 3 then I need a function which replaces the ascii code 3 back to
%c%

THX for everyone who can help me!

OK, so did you try to do it yourself already?

yeah I try to change ,"%c%" to "" . That works but the character 31 for %u% I cant type in my programm.
I need a command which converts a number to its ascii code. For example:

Code:

---

if (strncmp(str,chr(3),1)==0) {
        snprintf(out,max,"%s%s",out,"%c%");
        str+=1;
        c++; i+=1;

---

But c++ don't have a command like chr or I don't know it.

Now I try this

Code:

---

        const char *replace;
        snprintf(replace,sizeof(replace),"%c",3);
        for (i = 0; i < strlen(input); ) {
                if (strncmp(str,replace,1)==0) {

---

but

error C2664: '_snprintf' : cannot convert parameter 1 from 'const char *' to 'char *'

That's a big problem, because the function strncmp() want as second parameter a const char and I don't know how to give this function the ascii code 3. Please help me.

if you wanna replace a char containing a number as an ascii code, just do int x = y - '0'; (assuming y's a char)

> snprintf(replace,sizeof(replace),"%c",3);
Well replace doesn't point anywhere, and being a pointer, sizeof() doesn't do what you probably want it to do (assuming the pointer pointed somewhere)

> and I don't know how to give this function the ascii code 3.
Like

Code:

---

if ( strncmp ( buff, "%c\003", 3 ) == 0 )  // A character specified as 3 octal characters
if ( strncmp ( buff, "%c\x03", 3 ) == 0 )  // A character specified as 2 hex characters

---

OK my code now looks so:

Code:

---

int stylecodesback(char *input, char *out, int max) {
        int c = 0;
        char *str = input;
        memset(out,'\0',max);
        unsigned int i = 0;
        for (i = 0; i < strlen(input); ) {
                if (strncmp(str,"%c\x03",1)==0) {
                        snprintf(out,max,"%s%s",out,"%c%");
                        str+=1;
                        c++; i+=1;
                } else if (strncmp(str,"%c\x02",1)==0) {
                        snprintf(out,max,"%s%s",out,"%b%");
                        str+=1;
                        c++;i+=1;
                } else if (strncmp(str,"%c\x0F",1)==0) {
                        snprintf(out,max,"%s%s",out,"%o%");
                        str+=1;
                        c++;i+=1;
                } else if (strncmp(str,"%c\x1F",1)==0) {
                        snprintf(out,max,"%s%s",out,"%u%");
                        str+=1;
                        c++;i+=1;
                } else if (strncmp(str,"%c\x16",1)==0) {
                        snprintf(out,max,"%s%s",out,"%i%");
                        str+=1;
                        c++;i+=1;
                } else {
                        snprintf(out,max,"%s%c",out,str[0]);
                        str++;
                        i++;
                }
        }
        return c;
}

---

The 3 ascii character get replaced by %c, but it should look like this %c% and all other characters like 2 ascii to %b% are don't get replaced, whats wrong?

> if (strncmp(str,"%c\x03",1
Well there are 3 chars in your string, not 1.

Quote:

---

Originally Posted by Salem

> if (strncmp(str,"%c\x03",1
Well there are 3 chars in your string, not 1.

---

Hmm I understand it that way the %c\x03 represented the third ascii code. That is what I'm searching for in my string and this have a len of 1. When I write if (strncmp(str,"%c\x03",3
noting happens the char is as it was before.

I need something which finds the third ascii code. I looked that up in the msdn

http://msdn.microsoft.com/library/en...ml/vc38qo1.gif

and what I need is the ETX Code. I want to search for that in my text an replaces it with %c%

This is an example:

[7 %test% 3]

And the things before the "7" and the "3" I want to replace with %c%

"%c\x03"
%
c
\x03

Are 3 characters.

Perhaps you're matching entirely the wrong thing.

Quote:

---

Originally Posted by Salem

"%c\x03"
%
c
\x03

Are 3 characters.

Perhaps you're matching entirely the wrong thing.

---

Ok I see it %c\x03 cant be ascii code 3, because this function replaces every % in my text with a %c%. That is not really what I want. I only want to replace:

ascii3 with %c%
ascii2 with %b%
ascii15 with %o%
ascii31 with %u%
ascii22 with %i%

I might choose this type of approach.

Code:

---

#include <string.h>

static const struct style
{
    const char *key;
    int value;
} Style_Code[] =
{
    {"%c%",  3},
    {"%b%",  2},
    {"%o%", 15},
    {"%u%", 31},
    {"%i%", 22},
};

int foo(const char *in, char *out, int max)
{
    char *start = out;
    while ( *in != '\0' && max > 0 )
    {
        size_t i;
        for ( i = 0; i < sizeof Style_Code / sizeof *Style_Code; ++i )
        {
            size_t keylen = strlen(Style_Code[i].key);
            if ( strncmp(in, Style_Code[i].key, keylen) == 0 )
            {
                *out++ = Style_Code[i].value;
                in += keylen;
                break;
            }
        }
        if ( i >= sizeof Style_Code / sizeof *Style_Code )
        {
            *out++ = *in++;
        }
        --max;
    }
    *out = '\0';
    return out - start;
}

int bar(const char *in, char *out, int max)
{
    char *start = out;
    while ( *in != '\0' && max > 0 )
    {
        size_t i;
        for ( i = 0; i < sizeof Style_Code / sizeof *Style_Code; ++i )
        {
            if ( *in == Style_Code[i].value)
            {
                size_t keylen = strlen(Style_Code[i].key);
                strcpy(out, Style_Code[i].key);
                out += keylen;
                max -= keylen - 1;
                ++in;
                break;
            }
        }
        if ( i >= sizeof Style_Code / sizeof *Style_Code )
        {
            *out++ = *in++;
        }
        --max;
    }
    *out = '\0';
    return out - start;
}

---

Perfect Dave_Sinkula works exactly the way I want this function work. Thx alot :D