Good afternoon. I'm getting the error of the title. What's wrong with strdup?
Code:
binarytree.c:19:7: error: conflicting types for ‘strdup’
binarytree.c:91:7: error: conflicting types for ‘strdup’
Code:
struct tnode {
char *word;
int count;
struct tnode *left;
struct tnode *right;
};
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#define MAXWORD 100
struct tnode *addtree(struct tnode *, char *);
void treeprint(struct tnode *);
int getword(char *, int);
struct tnode *talloc(void);
char *strdup(char *);
int main(void)
{
struct tnode *root;
char word[MAXWORD];
root = NULL;
while(getword(word, MAXWORD) != EOF)
if(isalpha(word[0]) )
root = addtree(root, word);
treeprint(root);
return 0;
}
char buffer[MAXWORD];
int bp = 0;
int getword(char *word, int lim)
{
int c, getch(void);
void ungetch(int);
char *w = word;
while(isspace(c = getch()) )
;
if(c != EOF)
*w++ = c;
if(!isalpha(c))
{
*w = '\0';
return c;
}
for(; --lim > 0; w++)
if(!isalnum(*w = getch()) )
{
ungetch(*w);
break;
}
*w = '\0';
return word[0];
}
struct tnode *addtree(struct tnode *p, char *w)
{
int cond;
if(p == NULL)
{
p = talloc();
p->word = strdup(w);
p->count = 1;
p->left = p->right = NULL;
}
else if( (cond = strcmp(w, p->word) ) == 0)
p->count++;
else if(cond < 0)
p->left = addtree(p->left, w);
else
p->right = addtree(p->right, w);
return p;
}
#include <stdlib.h>
struct tnode *talloc(void)
{
return (struct tnode *) malloc(sizeof(struct tnode) );
}
char *strdup(char *s)
{
char *p;
p = (char *) malloc(strlen(s)+1);
if(p != NULL)
strcpy(p,s);
return p;
}
void treeprint(struct tnode *p)
{
if(p != NULL)
{
treeprint(p->left);
printf("%4d %s\n", p->count, p->word);
treeprint(p->right);
}
}