init

.gitignore

@@ -0,0 +1 @@
+line_counter

Main.c

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+#include <dirent.h>
+#include <stdio.h>
+#include <string.h>
+
+const char** filters = NULL;
+int filterAmount = 0;
+char path[PATH_MAX] = {'\0'};
+int pathLength = 0;
+int allLines = 0;
+
+void appendToPath(const char* s) {
+    for(int i = 0; pathLength < (PATH_MAX - 1) && s[i] != '\0'; i++) {
+        path[pathLength++] = s[i];
+    }
+    path[pathLength] = '\0';
+}
+
+int enterPath(const char* name) {
+    int length = pathLength;
+    appendToPath("/");
+    appendToPath(name);
+    return length;
+}
+
+void resetPath(int marker) {
+    path[marker] = '\0';
+    pathLength = marker;
+}
+
+void countLines() {
+    FILE* file = fopen(path, "r");
+    if(file == NULL) {
+        return;
+    }
+    int lines = 0;
+    while(1) {
+        int c = fgetc(file);
+        if(c == EOF) {
+            lines++;
+            break;
+        } else if(c == '\n') {
+            lines++;
+        }
+    }
+    printf("%s = %d\n", path, lines);
+    allLines += lines;
+    fclose(file);
+}
+
+void handleFile(const char* name) {
+    int end = strlen(name);
+    for(int i = 0; i < filterAmount; i++) {
+        int l = strlen(filters[i]);
+        if(end >= l && !strcmp(filters[i], name + (end - l))) {
+            int marker = enterPath(name);
+            countLines();
+            resetPath(marker);
+            return;
+        }
+    }
+}
+
+void scanFolder() {
+    DIR* dir = opendir(path);
+    if(dir == NULL) {
+        return;
+    }
+    while(1) {
+        struct dirent* entry = readdir(dir);
+        if(entry == NULL) {
+            break;
+        } else if(!strcmp(entry->d_name, ".") || !strcmp(entry->d_name, "..")) {
+            continue;
+        } else if(entry->d_type == DT_DIR) {
+            int marker = enterPath(entry->d_name);
+            scanFolder();
+            resetPath(marker);
+        } else if(entry->d_type == DT_REG) {
+            handleFile(entry->d_name);
+        }
+    }
+    closedir(dir);
+}
+
+int main(int argAmount, const char** args) {
+    if(argAmount < 3) {
+        if(argAmount > 0) {
+            printf("%s <path> <ending_1> [ending_2] ...\n", args[0]);
+        } else {
+            puts("... <path> <ending_1> [ending_2] ...");
+        }
+        return 0;
+    }
+    filters = args + 2;
+    filterAmount = argAmount - 2;
+    appendToPath(args[1]);
+    scanFolder();
+    printf("Lines: %d\n", allLines);
+    return 0;
+}

Makefile

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+all: line_counter
+	
+line_counter: Main.c
+	gcc -o $@ Main.c -Wall -Wextra -Werror -pedantic -O3
+	
+clean:
+	rm -f line_counter