12-19-2014
Quote:
Originally Posted by
metallica1973
I believe the path I need to go is to use a struct of arrays and pass the data to it.
Since arrays are not arbitrary-sized in C, you would be wasting a lot of space.
Also, just dumping data into the array wouldn't make it line up with the array. You would still need to process the data using something like the code we've already shown you.
Last edited by Corona688; 12-19-2014 at 06:41 PM..
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT DEBIAN
dynarr_free
DYNARR(3pub) C Programmer's Manual DYNARR(3pub)
NAME
dynarr, dynarr_init, dynarr_resize, dynarr_free - simple dynamic arrays
SYNOPSIS
#include <publib.h>
void dynarr_init(struct dynarr *da, size_t elsize);
int dynarr_resize(struct dynarr *da, size_t newsize);
void dynarr_free(struct dynarr *da);
DESCRIPTION
These functions make it easier to use dynamic arrays, i.e., arrays that are allocated with malloc(3) and resized with realloc(3). Below is
a typical code fragment for implementing a dynamic array that is resized as more input is read.
char *p, *line;
size_t alloc, len;
len = 0;
alloc = 1024;
if ((line = malloc(alloc)) == NULL) abort();
while (fgets(line + len, alloc-len, stdin) != NULL) {
len = strlen(line);
alloc += 1024;
if ((p = realloc(alloc)) == NULL) abort();
alloc = p;
}
(The error handling is intentionally simplified.) Below is the above fragment with the dynarr(3).
struct dynarr da;
dynarr_init(&da);
while (fgets((char *)da.data + da.used, da.alloc-da.len, stdin) != NULL) {
da.used = strlen(da.data);
if (dynarr_resize(&da, da.alloc + 1024) == -1) abort();
}
The code is a bit simpler, and all the memory allocation details and most of the error checking code is hidden away.
The dynamic array is represented by a struct dynarr:
struct dynarr {
void *data;
size_t alloc, used;
};
The interface to the dynamic allocation has intentionally been made unopaque.
dynarr_init initializes a struct dynarr to be an empty array, dynarr_resize sets its size to be newsize, and dynarr_free frees the array
(it will become an empty array again).
RETURNS
dynarr_resize returns -1 if it failed, 0 if it succeeded. It does not change the array in any way if it failed.
SEE ALSO
publib(3), malloc(3), realloc(3), strdup(3)
AUTHOR
Lars Wirzenius (lars.wirzenius@helsinki.fi)
Publib C Programmer's Manual DYNARR(3pub)