I try to run an example code in K&R (p30) using Xcode. I got conflicting types error for 'getline' and when I call getline
, I was informed that I should pass 3
arguments to it, instead of 2
. I'm confused.
#include <stdio.h>
#define MAXLINE 1000 /* maximum input line length */
int getline(char line[], int maxline);
void copy(char to[], char from[]);
/* print the longest input line */
int main()
{
int len; /* current line length */
int max; /* maximum length seen so far */
char line[MAXLINE]; /* current input line */
char longest[MAXLINE]; /* longest line saved here */
max = 0;
while ((len = getline(line[MAXLINE], MAXLINE)) > 0)
if (len > max) {
max = len;
copy(longest, line);
}
if (max > 0) /* there was a line */
printf("%s", longest);
return 0;
}
/* getline: read a line into s, return length */
int getline(char s[],int lim)
{
int c, i;
for (i=0; i < lim-1 && (c=getchar())!=EOF && c!='\n'; ++i)
s[i] = c;
if (c == '\n') {
s[i] = c;
++i;
}
s[i] = '\0';
return i;
}
/* copy: copy 'from' into 'to'; assume to is big enough */
void copy(char to[], char from[])
{
int i;
i = 0;
while ((to[i] = from[i]) != '\0')
++i;
}
Since K&R was written, POSIX has added a function getline()
which has a different interface from the one in K&R:
ssize_t getline(char **restrict lineptr, size_t *restrict n, FILE *restrict stream);
The only reasonable way around it is to rename the function in the code copied from the book.
(It was a nuisance when it was added — I'd used a variant on the K&R code for 20+ years, but there's no point in fighting it.)
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