First commit

1 files changed, 35 insertions, 0 deletions

diff --git a/greet.c b/greet.c
new file mode 100644
index 0000000..9d524ae
--- /dev/null
+++ b/greet.c
@@ -0,0 +1,35 @@
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int
+main(int argc, char *argv[])
+{
+	char *people;
+	int i, size, written;
+
+	people = NULL;
+	size = 0;
+	written = 0;
+
+args:	if(argc==1){
+		fprintf(stderr, "usage: %s person ...\n", argv[0]);
+		return 1;
+	}
+	else if(argc==2)
+		people = argv[1];
+	else
+		for(i = 1; i<argc; i++){
+			if(written+strlen(argv[i])>size){
+				size += written+strlen(argv[i])+20;
+				people = realloc(people, size+1);
+				if(people==NULL) err(1, "realloc");
+			}
+concat:			if(i==argc-1) strcat(people, " and ");
+			else if(i>1) strcat(people, ", ");
+			strcat(people, argv[i]);
+		}
+
+end:	printf("Hello %s!\n", people);
+}