Recebendo de stdin e vários arquivos como argumentos

wc.c

@@ -2,26 +2,53 @@
 #include <stdlib.h>
 #include <string.h>
 
-int main(int argc, char **argv) {
+int intlen(int number) {
+    // return ceil(log10(number+1));
+    char buffer[10];
+    sprintf(buffer, "%d", number);
+    return strlen(buffer);
+}
+
+void wc(char **list, int count) {
     char buffer[BUFSIZ];
-    int lines = 0, words = 0, bytes = 0;
-    FILE *stream = fopen(argv[1], "r");
-    if (stream == NULL) {
-        perror("Erro ao abrir o arquivo");
-        exit(EXIT_FAILURE);
+    int clines = 0, cwords = 0, cbytes = 0;
+    for (int i = 1; i < count; i++) {
+        int lines = 0, words = 0, bytes = 0;
+        FILE *stream = fopen(list[i], "r");
+        if (stream == NULL) {
+            perror("Erro ao abrir o arquivo");
+            exit(EXIT_FAILURE);
+        }
+        while (fgets(buffer, BUFSIZ, stream) != NULL) {
+            /* bytes     */
+            bytes += strlen(buffer);
+            char *str;
+            /* words     */
+            str = strdup(buffer);
+            while (strtok_r(str, " \t\n", &str) != NULL)
+                words++;
+            /* lines     */
+            lines++;
+        }
+        if (strcmp(list[i], "/dev/stdin") == 0)
+            list[i] = "";
+        clines += lines;
+        cwords += words;
+        cbytes += bytes;
+        printf("%d %d %d %s\n", lines, words, bytes, list[i]);
+        fclose(stream);
     }
-    while (fgets(buffer, BUFSIZ, stream) != NULL) {
-        /* bytes     */
-        bytes += strlen(buffer);
-        char *str;
-        /* words     */
-        str = strdup(buffer);
-        while (strtok_r(str, " \t\n", &str) != NULL)
-            words++;
-        /* lines     */
-        lines++;
+    if (count > 2)
+        printf("%d %d %d total\n", clines, cwords, cbytes);
+}
+
+int main(int argc, char **argv) {
+    char *list[2];
+    if (argc < 2) {
+        list[1] = "/dev/stdin";
+        wc(list, 2);
+    } else {
+        wc(argv, argc);
     }
-    printf("%d %d %d %s\n", lines, words, bytes, argv[1]);
-    fclose(stream);
     return EXIT_SUCCESS;
 }