Add comments to mygrep, begin implementing the http client

http/Makefile

@@ -0,0 +1,27 @@
+CC = gcc
+CFLAGS = -std=c99 -pedantic -Wall -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -D_POSIX_C_SOURCE=200809L -g -c
+TARGET_1 = client
+TARGET_2 = server
+
+all: $(TARGET_1).c $(TARGET_2).c
+	$(CC) $(CFLAGS) $(TARGET_1).c $(TARGET_2).c
+	$(CC) $(TARGET_1).o -o $(TARGET_1)
+	$(CC) $(TARGET_2).o -o $(TARGET_2)
+
+client: $(TARGET_1).c
+	$(CC) $(CFLAGS) $(TARGET_1).c
+	$(CC) $(TARGET_1).o -o $(TARGET_1)
+
+server: $(TARGET_2).c
+	$(CC) $(CFLAGS) $(TARGET_2).c
+	$(CC) $(TARGET_2).o -o $(TARGET_2)
+
+install:
+	cp $(TARGET_1) /usr/local/bin/myhttp-$(TARGET_1)
+	cp $(TARGET_2) /usr/local/bin/myhttp-$(TARGET_2)
+
+clean:
+	$(RM) $(TARGET_1).o
+	$(RM) $(TARGET_1)
+	$(RM) $(TARGET_2).o
+	$(RM) $(TARGET_2)

http/client.c

@@ -0,0 +1,84 @@
+#define _GNU_SOURCE ///< in order for optarg to be defined
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "shared/http.h"
+
+int main(int argc, char *argv[]) {
+    check_opts_number(argc);
+
+    int port = 80;
+    char *ofile = NULL;
+    char *dir = NULL;
+    char *url = NULL;
+    int c;
+
+    /// Process the options
+    while((c = getopt(argc, argv, "p:o:d:h")) != -1) {
+        switch(c) {
+            case 'p':
+                port = atoi(optarg);
+                break;
+            case 'o':
+                ofile = optarg;
+                break;
+            case 'd':
+                dir = optarg;
+                break;
+            case 'h':
+                printf("Command usage:\n");
+                print_usage();
+                exit(EXIT_SUCCESS);
+                break;
+            case '?':
+                print_usage();
+                exit(EXIT_FAILURE);
+            default:
+                abort();
+        }
+    }
+
+    /// Check for the case that both output file and directory are set
+    if(ofile != NULL && dir != NULL) {
+        printf("Either output file or directory is specified. You cannot use both.\n");
+        print_usage();
+        exit(EXIT_FAILURE);
+    }
+
+    /// Check if the required argument is there
+    if(argv[optind] == NULL) {
+        fprintf(stderr, "Mandatory argument 'url' missing.\n");
+        print_usage();
+        exit(EXIT_FAILURE);
+    } else {
+        url = argv[optind];
+    }
+
+    const char *full_url = strstr(url, "http://") + 7; //< the full url starts after http://
+    const char *path = strstr(full_url, "/");
+}
+
+static void print_usage(void) {
+    printf("client [-p PORT] [ -o FILE | -d DIR ] URL\n");
+}
+
+/**
+ * @brief Function to check the number of arguments
+ * @details Checks the number of arguments supplied to the command line.
+ *          If the arguments are less than the required or more than possible, it exits
+ * @param argc Number of arguments obtained from the command line
+ * @return none
+ *
+ **/
+static void check_opts_number(int argc) {
+    if(argc <= 1) {
+        fprintf(stderr, "At least one argument expected.\n");
+        print_usage();
+        exit(EXIT_FAILURE);
+    } else if(argc > 6) {
+        fprintf(stderr, "Too many arguments supplied.\n");
+        print_usage();
+        exit(EXIT_FAILURE);
+    }
+}

http/shared/http.h

@@ -0,0 +1,7 @@
+#ifndef HTTP_HEADER_FILE
+#define HTTP_HEADER_FILE
+
+static void print_usage();
+static void check_opts_number(int argc);
+
+#endif