Solve exercise 1.18

1 files changed, 38 insertions, 0 deletions

diff --git a/1-18_strip-blanks.c b/1-18_strip-blanks.c
new file mode 100644
index 0000000..c766445
--- /dev/null
+++ b/1-18_strip-blanks.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+
+#define MAXLINELENGTH 9001
+/* Write a program to remove trailing blanks and tabs from each line of input,
+   and to delete entirely blank lines. */
+
+int get_line(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 + 1] = '\0';
+	return i;
+}
+
+int main(void) {
+	char buffer[MAXLINELENGTH];
+	int c, i, len;
+
+	/* Make sure every line is gone over */
+	while (len = get_line(buffer, MAXLINELENGTH)) {
+		/* An empty for statement, simply to change the i variable. */
+		for (i = len - 2; (i > 0) && (buffer[i] == ' ') || (buffer[i] == '\t'); --i);
+
+		/* We've reached the end of the line's actual content. Terminate the line. */
+		if (i >= 1) {
+			buffer[i + 1] = '\n';
+			buffer[i + 2] = '\0';
+			printf("%s", buffer);
+		}
+	}
+}
+