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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-d denominator] ... [-nxyza] [-- value ...] ...")
static void
new_row(double **kernel, size_t *col, size_t *rows, size_t *cols)
{
if (!*col)
return;
if (*rows && *col != *cols)
eprintf("the rows in the matrix do not have the same number of columns\n");
*kernel = erealloc3(*kernel, 1 + ++*rows, *cols = *col, sizeof(**kernel));
*col = 0;
}
static void
new_col(char *arg, double **kernel, size_t *col, size_t *rows, size_t *cols)
{
if (*rows && *col >= *cols)
eprintf("the rows in the matrix do not have the same number of columns\n");
if (!*rows)
*kernel = erealloc2(*kernel, *col + 1, sizeof(**kernel));
if (tolf(arg, &(*kernel)[*rows * *cols + (*col)++]))
eprintf("matrix cell values must be floating-point values\n");
}
static void
finalise(double **kernel, size_t col, size_t *rows, size_t *cols)
{
if (col)
new_row(kernel, &col, rows, cols);
if (!*rows)
eprintf("the matrix cannot be null-sized\n");
}
static double *
read_matrix_cmdline(char *args[], size_t *rows, size_t *cols)
{
size_t col = 0;
double *kernel = NULL;
*rows = *cols = 0;
for (; *args; args++) {
if (!strcmp(*args, "--"))
new_row(&kernel, &col, rows, cols);
else
new_col(*args, &kernel, &col, rows, cols);
}
finalise(&kernel, col, rows, cols);
return kernel;
}
static double *
read_matrix_stdin(size_t *rows, size_t *cols)
{
char *line = NULL, *p, *q;
size_t size = 0, col = 0;
double *kernel = NULL;
ssize_t len;
*rows = *cols = 0;
while ((len = getline(&line, &size, stdin)) >= 0) {
col = 0;
for (p = line;; p = q) {
while (*p && isspace(*p)) p++;
if (!*(q = p))
break;
while (*q && !isspace(*q)) q++;
*q++ = '\0';
new_col(p, &kernel, &col, rows, cols);
}
new_row(&kernel, &col, rows, cols);
}
free(line);
if (ferror(stdout))
eprintf("getline:");
finalise(&kernel, col, rows, cols);
return kernel;
}
int
main(int argc, char *argv[])
{
int normalise = 0;
double denominator = 1;
int id_x = 1, id_y = 1, id_z = 1, id_a = 1;
size_t rows, cols, y, x, n;
double *kernel, *kern, sum = 0, value;
double *buffer, *buf, id_val;
ARGBEGIN {
case 'd':
denominator *= etolf_flag('d', UARGF());
break;
case 'n':
normalise = 1;
break;
case 'x':
id_x = 0;
break;
case 'y':
id_y = 0;
break;
case 'z':
id_z = 0;
break;
case 'a':
id_a = 0;
break;
default:
usage();
} ARGEND;
if (id_x && id_y && id_z && id_a)
id_x = id_y = id_z = id_a = 0;
if (argc)
kernel = read_matrix_cmdline(argv, &rows, &cols);
else
kernel = read_matrix_stdin(&rows, &cols);
FPRINTF_HEAD(stdout, (size_t)1, cols, rows, "xyza");
efflush(stdout, "<stdout>");
buffer = emalloc2(cols, 4 * sizeof(double));
n = cols * 4 * sizeof(double);
if (normalise) {
kern = kernel;
for (y = 0; y < rows; y++)
for (x = 0; x < cols; x++)
sum += *kern++;
denominator *= sum;
}
kern = kernel;
for (y = 0; y < rows; y++) {
buf = buffer;
for (x = 0; x < cols; x++) {
id_val = (x == cols / 2 && y == rows / 2) ? 1. : 0.;
value = *kern++ / denominator;
buf[0] = id_x ? id_val : value;
buf[1] = id_y ? id_val : value;
buf[2] = id_z ? id_val : value;
buf[3] = id_a ? id_val : value;
buf += 4;
}
ewriteall(STDOUT_FILENO, buffer, n, "<stdout>");
}
free(kernel);
free(buffer);
return 0;
}
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