made work: line numbers in files with the correct indentation level (tested on a > 1000 lines file)

Makefile

@@ -1,6 +1,6 @@
 CC := gcc
 CFLAGS := -Wall -Werror
-LIBS := -lvector -lfile -llist
+LIBS := -lvector -lfile -llist -lutil
 LIBSPATH := -L/usr/lib/odweta/
 INCLUDEDIR := -I/usr/include/odweta/
 PATCH := -Wl,-rpath=/usr/lib/odweta/
@@ -9,7 +9,7 @@ PATCH := -Wl,-rpath=/usr/lib/odweta/
 
 default: demo
 
-demo: demo.c libvector.so libfile.so liblist.so
+demo: demo.c libvector.so libfile.so liblist.so libutil.so
 	sudo $(CC) $(CFLAGS) -o $@ $< $(PATCH) $(INCLUDEDIR) $(LIBSPATH) $(LIBS)
 
 libvector.so: src/vector.c
@@ -24,15 +24,19 @@ liblist.so: src/list.c
 	sudo $(CC) -c -fpic $< -o /usr/lib/odweta/list.o
 	sudo $(CC) -shared -o /usr/lib/odweta/$@ /usr/lib/odweta/list.o
 
+libutil.so: src/util.c
+	sudo $(CC) -c -fpic $< -o /usr/lib/odweta/util.o
+	sudo $(CC) -shared -o /usr/lib/odweta/$@ /usr/lib/odweta/util.o
+
 install:
 	sudo mkdir -p /usr/include/odweta/
 	sudo mkdir -p /usr/lib/odweta/
-	sudo cp src/vector.c src/file.c src/list.c include/vector.h include/file.h include/list.h /usr/include/odweta/
+	sudo cp src/vector.c src/file.c src/list.c src/util.c include/vector.h include/file.h include/list.h include/util.h /usr/include/odweta/
-	sudo make libvector.so libfile.so liblist.so
+	sudo make libvector.so libfile.so liblist.so libutil.so
 	sudo ldconfig # update ldconfig cache
 
 clean:
-	sudo rm -f main /usr/lib/odweta/vector.o /usr/lib/odweta/file.o /usr/lib/odweta/libvector.so /usr/lib/odweta/libfile.so /usr/lib/odweta/list.o /usr/lib/odweta/liblist.so
+	sudo rm -f main /usr/lib/odweta/vector.o /usr/lib/odweta/file.o /usr/lib/odweta/list.o /usr/lib/odweta/util.o /usr/lib/odweta/libvector.so /usr/lib/odweta/libfile.so /usr/lib/odweta/liblist.so /usr/lib/odweta/libutil.so
 
 cleanrepo:
 	rm -fr ./demo ./moved_copy_of_test.txt ./copy_of_test.txt

README.md

@@ -19,11 +19,10 @@ Examples of this work of art are in the `/examples/` directory of this repo.
 5. Moving (renaming) a file to another file
 6. Deleting a file
 7. Checking if a file exists
+8. Add line numbers at the beggining of each line in a file (with correct indentation)
 
 #### TODO:
 
-1. Add line numbers at the beggining of each line in a file
-
 + You tell me
 
 ## Vectors (dynamic arrays)

demo.c

@@ -1,3 +1,18 @@
+// #include <stdio.h>
+// #include <odweta/util.h>
+//
+// int main() {
+//     char* string = intToString(1729843);
+//
+//     printf("final string: %s\n", string);
+//
+//     char* sstring = intToString(123);
+//
+//     printf("final string: %s\n", sstring);
+//
+//     return 0;
+// }
+
 #include <odweta/file.h>
 #include <stdio.h>
 
@@ -10,7 +25,7 @@ int main() {
 
     printf("\nconvering the file contents into a string (char*)\n");
     char* string = fileToString(f);
-    printf("\"%s\"\n", string);
+    printf("\"\"\"\n%s\"\"\"\n", string);
 
     printf("writing is quite simple, just call the 'fileWrite(file_t*, char*)' or 'fileWriteln(file_t*, char*)' function, where the second argument is the string you want to write into a file\nthe 'fileWriteln()' function writes the specified string AND a '\\n' after it, whereas the 'fileWrite()' function does not append the '\\n'\n");
 	fileWrite(f, "'this will not end with a \"\\n\"' ");
@@ -40,9 +55,27 @@ int main() {
     filePrint(move_dst);
 
     fileCleanup(src);
-    printf("DO NOT cleanup a deleted file! (dst, in this case) it is already done for you by the 'fileMove(file_t*)' function\n");
+    printf("DO NOT cleanup a deleted file! (dst, in this case) it is already done for you by the 'fileMove(file_t*, char*)' function\n");
     // fileCleanup(dst);
     fileCleanup(move_dst);
 
+    printf("when copying and moving files, the first argument is a file_t* (source file) and the second argument is a char* (the path of the destination file), not a file_t*!\n");
+
+    printf("prepending line numbers at the beggining of each line in a file\n");
+
+    file_t* g = fileInit("test.txt");
+    fileCopy(g, "copy_of_test.txt");
+    file_t* g_copy = fileInit("copy_of_test.txt");
+    fileNumberLines(g_copy);
+
+    printf("file withOUT prepended numbers:\n");
+    filePrint(g);
+
+    printf("file with prepended numbers:\n");
+    filePrint(g_copy);
+
+    fileCleanup(g);
+    //fileCleanup(g_copy);
+
     return 0;
 }

examples/file/filedemo.c

@@ -1,3 +1,18 @@
+// #include <stdio.h>
+// #include <odweta/util.h>
+//
+// int main() {
+//     char* string = intToString(1729843);
+//
+//     printf("final string: %s\n", string);
+//
+//     char* sstring = intToString(123);
+//
+//     printf("final string: %s\n", sstring);
+//
+//     return 0;
+// }
+
 #include <odweta/file.h>
 #include <stdio.h>
 
@@ -10,7 +25,7 @@ int main() {
 
     printf("\nconvering the file contents into a string (char*)\n");
     char* string = fileToString(f);
-    printf("\"%s\"\n", string);
+    printf("\"\"\"\n%s\"\"\"\n", string);
 
     printf("writing is quite simple, just call the 'fileWrite(file_t*, char*)' or 'fileWriteln(file_t*, char*)' function, where the second argument is the string you want to write into a file\nthe 'fileWriteln()' function writes the specified string AND a '\\n' after it, whereas the 'fileWrite()' function does not append the '\\n'\n");
 	fileWrite(f, "'this will not end with a \"\\n\"' ");
@@ -46,5 +61,21 @@ int main() {
 
     printf("when copying and moving files, the first argument is a file_t* (source file) and the second argument is a char* (the path of the destination file), not a file_t*!\n");
 
+    printf("prepending line numbers at the beggining of each line in a file\n");
+
+    file_t* g = fileInit("test.txt");
+    fileCopy(g, "copy_of_test.txt");
+    file_t* g_copy = fileInit("copy_of_test.txt");
+    fileNumberLines(g_copy);
+
+    printf("file withOUT prepended numbers:\n");
+    filePrint(g);
+
+    printf("file with prepended numbers:\n");
+    filePrint(g_copy);
+
+    fileCleanup(g);
+    //fileCleanup(g_copy);
+
     return 0;
 }

include/file.h

@@ -32,4 +32,6 @@ int fileExists(file_t* f);						// 1 = yes, 0 = no
 
 void fileCreateEmpty(char* path);				// create an empty file with the given name
 
+void fileNumberLines(file_t* f);				// prepend line numbers in front of each line in a file
+
 #endif

include/util.h

@@ -0,0 +1,10 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+char* intToString(int x);                       // convert an int into a string
+
+long pow(int x, int n);                         // x^n
+
+int maxLowerPowerOf10(int x);                   // biggest power of 10 that is < x
+
+#endif

src/file.c

@@ -1,5 +1,6 @@
 #include <odweta/file.h>
 #include <odweta/vector.h>
+#include <odweta/util.h>
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -189,6 +190,7 @@ fileCopy(file_t* src, char* dst) {
 	FILE* fd = fopen(dst, "w");
     if (!fd) {
         fprintf(stderr, "could not open file for writing\n");
+        fclose(fd);
         exit(EXIT_FAILURE);
     }
 
@@ -213,6 +215,7 @@ fileDelete(file_t* f) {
         // fileCleanup(f); // don't know if this is necessary... :shrug:
         // exit(EXIT_FAILURE);
     }
+
     fileCleanup(f);
 }
 
@@ -222,3 +225,34 @@ fileMove(file_t* src, char* dst) {
 
     fileDelete(src);
 }
+
+void
+fileNumberLines(file_t* f) {
+    FILE* fd = fopen(f->path, "w");
+    if (!fd) {
+        fprintf(stderr, "could not open file for writing\n");
+        fclose(fd);
+        exit(EXIT_FAILURE);
+    }
+
+    int mlp = maxLowerPowerOf10(f->length);
+
+    for (int i = 0; i < f->length; i++) {
+        // print to the file descriptor
+        fprintf(fd, "%d %s\n", i+1, (char*)vectorToString((vector_t *)vectorGetAt(f->lines, i)));
+
+        // print to f->lines
+        vectorInsertAt((vector_t*)vectorGetAt(f->lines, i), 0, &(char){' '});
+        char* string = intToString(i+1);
+        for (int j = strlen(string)-1; j >= 0; j--) {
+            vectorInsertAt((vector_t*)vectorGetAt(f->lines, i), 0, &(char){string[j]});
+        }
+
+        // prepend the correct amount of ' '
+        for (int j = 0; j < strlen(intToString(mlp))-strlen(intToString(i+1)); j++) {
+            vectorInsertAt((vector_t*)vectorGetAt(f->lines, i), 0, &(char){' '});
+        }
+    }
+
+    fclose(fd);
+}

src/util.c

@@ -0,0 +1,51 @@
+#include <odweta/util.h>
+#include <odweta/vector.h>
+
+char*
+intToString(int x) {
+    vector_t* string = vectorInit(CHAR);
+
+    if (x > 0 && x < 10) {
+        vectorPush(string, &(char){x+48});
+        char* retval = (char*)vectorToString(string);
+        vectorCleanup(string);
+        return retval;
+    } else {
+        while (x > 0) {
+            int lastDigit = x % 10;
+            x /= 10;
+            vectorInsertAt(string, 0, &(char){lastDigit+48});
+        }
+        vectorPop(string);
+        char* retval = (char*)vectorToString(string);
+        vectorCleanup(string);
+        return retval;
+    }
+}
+
+long
+pow(int x, int n) {
+    long retval = 1;
+
+    for (int i = 0; i < n; i++) {
+        retval *= x;
+    }
+
+    return retval;
+}
+
+int
+maxLowerPowerOf10(int x) {
+    int i = 0;
+    long prev = pow(10, i++);
+
+    while (1) {
+        long now = pow(10, i);
+        if (now >= x) {
+            return (int)prev;
+        }
+        prev = now;
+        i++;
+    }
+
+}

src/vector.c

@@ -324,7 +324,9 @@ vectorGetAt(vector_t* v, int index) {
 
 void
 vectorSetAt(vector_t* v, int index, void* element) {
-    if (index >= v->size) {
+    if (v->size == 0) {
+        vectorPush(v, element);
+    } else if (index >= v->size) {
         fprintf(stderr, "index out of range\n");
         exit(EXIT_FAILURE);
     }
@@ -350,7 +352,9 @@ vectorSetAt(vector_t* v, int index, void* element) {
 
 void
 vectorInsertAt(vector_t* v, int index, void* element) {
-    if (index >= v->size) {
+    if (v->size == 0) {
+        vectorPush(v, element);
+    } else if (index >= v->size) {
         fprintf(stderr, "index out of range\n");
         exit(EXIT_FAILURE);
     }

test.txt

@@ -4,4 +4,3 @@ and
 
 this was an empty line
 !#%!@# <- symbols!
-'this will not end with a "\n"' this line was appended