*String to String[] to *String

[hajas]

how can I copy a string like *String to a string like String[]? and vice-versa?

thanks!

[Salem]

strcpy

[vb.bajpai]

*String ---> String[]

#include<stdio.h>
#include<string.h>

main(void)
{
   char *String1 = "Program";
   int len = strlen(String1);
   
   char String2[len];
   
   strcpy(String2,String1);
   
   printf("%s = %s", String1,String2);
   
   getchar();
   return(0);
         
}

String[] ---> *String

#include<stdio.h>
#include<string.h>

main(void)
{
   char String1[] = "Program";
   
   char *String2;  
   
   strcpy(String2,String1);
   
   printf("%s = %s", String1,String2);
   
   getchar();
   return(0);
         
}

[hajas]

thanks... but I have a little problem here.

I will only know the *String after few lines of code... so I can't know the lenght of this when I declare the strings... is possible to change the size after declare? so how can I do that?

thanks again!

[ssharish2005]

So use dynamic memory allocation method. Once you know the length of the array do

char *str;

str = malloc( sizeof char * len+1);

FYI: If you still need increase the size use realloc function . I case if you wanted to increase the size in the future.

EDIT: You need one more byte for null as well.
ssharish2005

[robwhit]

don't forget to check for failure and to free it when you're done.

[hajas]

but this is a pointer right?

I'm like this:

char *String;
char NewStr[];


do some lines of code than I get *String;

len = strlen(String);

NewStr[] = malloc( sizeof char * len); // can I do that?

well, I need to read/copy char by char of this string to another, but seams that I can't do it like this:

char *String; //I can't change this!
char *NewStr;
		   while (String[j] != '}'){ 
			   NewStr[i] = String[j];
			   i++;j++;
		   }

so I think if *NewStr was a NewStr[] will work... or am I wrong?

thanks again!

[robwhit]

NewStr[] is an array with an undetermined number of elements. It won't take a value returned from malloc. You'll need a pointer for that.

[hajas]

hmmm... so how I get the same result as the loop below using pointers?

char *String; 
char *NewStr;
		   while (String[j] != '}'){ 
			   NewStr[i] = String[j];
			   i++;j++;
		   }

thanks again!

[vart]

but you stilll need a malloc

[robwhit]

http://www.cprogramming.com/tutorial/c/lesson6.html

[zacs7]

Your also not allocating enough room for the null terminator

[hajas]

ok, I need do a malloc... but about my loop? is right?

is just because I do not alloc/free mem that didn't work? or what I did isn't possible to do with pointers like I did? or BOTH???

thanks again!

[hajas]

remove everything, then I'm trying part by part... but I'm stuck in the first one.

any of what you post worked.

/*
 =================
 CM_LoadEntityString
 =================
*/
static void CM_LoadEntityString (const byte *data, const lump_t *l){

	char	*game = Cvar_VariableString("fs_game"); // declare game - Hajas
	FILE	*f, *g;
	int		i, j, Tam, TamNew;
	int		PA, PB, PC, PD, PL, Num, Espaco, Aspas;
	char	*p = NULL, *ori = NULL, *HStr = NULL, *NewStr = NULL, *FinalStr = NULL;
	char	*PartA = NULL, *PartB = NULL, *PartC = NULL, *PartD = NULL;


	cm_numEntityChars = l->fileLen;
	if (cm_numEntityChars < 1)
		return;
	if (cm_numEntityChars > MAX_MAP_ENTSTRING)
		Com_Error(ERR_DROP, "CM_LoadMap: map '%s' has too large entity lump", cm_map);

	cm_entityString = Hunk_Alloc(cm_numEntityChars + 1);
	memcpy(cm_entityString, data + l->fileOfs, cm_numEntityChars);

	f = fopen ("entityORI.cfg", "wb");
	fprintf(f, "%s\n", cm_entityString);
	fclose(f);

	//if (!Q_stricmp(game, "arena")){
		// do string manipulation over cm_entityString
		*NewStr = 0;
		*FinalStr = 0;
		Tam = strlen(cm_entityString);
		HStr = malloc(sizeof cm_entityString);
		strcpy(HStr, cm_entityString); // copy the original string to mine
   
	g = fopen ("entityALT.cfg", "wb");
	fprintf(g, "%s\n", HStr);
	fclose(g);
	free(HStr);
	//}
}

abort the game....

I tryed these lines too:

HStr = malloc(sizeof (cm_entityString));
HStr = malloc(sizeof char * cm_entityString);
HStr = malloc(Tam);
HStr  = Hunk_Alloc(sizeof(cm_entityString));

nothing works... I'm doing nothing aside copy the string, why is not working?

[robwhit]

ptr = malloc(sizeof(type) * elements);