tools/trim at master · pips-/tools · GitHub

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#!/usr/bin/tcc -run
/* vim: set syn=c: */

#include <stdlib.h>
#include <stdio.h>

/*
 * 0x09 - horizontal tab
 * 0x0a - linefeed
 * 0x0b - vertical tab
 * 0x0c - form feed
 * 0x0d - carriage return
 * 0x20 - space
 **/

int
main() {
	char	*linein = NULL, *lineout = NULL;
	size_t	len = 0, lastblankchar = 0;
	ssize_t	nread;

	unsigned int trimmingleft = 1;

	unsigned int i, j;

	while ((nread = getline(&linein, &len, stdin)) > 0) {
		trimmingleft = 1;
		lastblankchar = j = 0;

		lineout = malloc(nread+1);

		for (i = 0; i < nread; ++i) {
			if (trimmingleft) {
				if(linein[i] != 0x09 &&
				   linein[i] != 0x0a &&
				   linein[i] != 0x0b &&
				   linein[i] != 0x0c &&
				   linein[i] != 0x0d &&
				   linein[i] != 0x20) {
					trimmingleft = 0;
				}
			}
			if (!trimmingleft){
				if(linein[i] != 0x09 &&
				   linein[i] != 0x0a &&
				   linein[i] != 0x0b &&
				   linein[i] != 0x0c &&
				   linein[i] != 0x0d &&
				   linein[i] != 0x20) {
					lastblankchar = j + 1;
				}
			}
			if (!trimmingleft) {
				lineout[j++] = linein[i];
			}
		}

		lineout[lastblankchar]   = '\n';
		lineout[lastblankchar+1] = '\0';

		printf("%s", lineout);

		free(lineout);
	}

	return 0;
}