git ssb

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#define _POSIX_SOURCE
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "pngspark.h"
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char float_chars[(unsigned char)-1] = {
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	['0'] = 1, ['1'] = 1, ['2'] = 1, ['3'] = 1, ['4'] = 1,
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	['5'] = 1, ['6'] = 1, ['7'] = 1, ['8'] = 1, ['9'] = 1,
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	['.'] = 1, ['-'] = 1, ['e'] = 1, ['E'] = 1, 0
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};
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void usage(const char *progname)
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{
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	errx(1, "Usage: %s output.png [-h height] "
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			"[-c color] [-s scaling]", progname);
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}
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int main(int argc, char *argv[])
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{
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	struct pngspark ps;
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	const char *color = "#000000";
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	const char *filename = NULL;
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	double scaling = 0.8;
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	int height = 10;
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	for (int i = 1; i < argc; i++) {
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		if (argv[i][0] != '-') {
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			if (filename) {
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				usage(argv[0]);
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			} else {
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				filename = argv[i];
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			}
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		} else if (argv[i][2]) {
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			errx(1, "extra argument: %s", argv[i]);
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		} else switch (argv[i][1]) {
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			case 'c':
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				if (++i < argc) color = argv[i];
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				break;
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			case 'h':
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				if (++i < argc) height = atoi(argv[i]);
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				break;
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			case 's':
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				if (++i < argc) scaling = atof(argv[i]);
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				break;
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		}
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	}
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	if (!filename) {
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		usage(argv[0]);
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	}
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	FILE *file = fopen(filename, "w");
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	if (!file) err(1, "unable to open file %s", filename);
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	if (pngspark_init(&ps, height, color, scaling) < 0)
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		return 1;
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	char c;
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	char buffer[32];
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	do {
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		unsigned int i = 0;
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		for (c = getchar(); float_chars[(unsigned char)c]; c = getchar())
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			if (i >= sizeof buffer) {
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				warnx("number too big: %.*s\n", (int)(sizeof buffer), buffer);
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				break;
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			} else
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				buffer[i++] = c;
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		if (!i) continue;
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		buffer[i] = '\0';
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		double value = atof(buffer);
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		if (pngspark_append(&ps, value) < 0)
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			return 1;
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	} while (c != EOF);
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	if (pngspark_write(&ps, file) < 0)
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		return 1;
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	if (pngspark_end(&ps) < 0)
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		return 1;
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	if (fclose(file) < 0)
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		err(1, "close %s", filename);
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	return 0;
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}
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