Update progress of 1-23

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.0)
 project(learningc LANGUAGES C)
 
 set(CHAPTER 1)
-set(EXERCISE 22)
+set(EXERCISE 23)
 
 add_executable(learningc chapters/${CHAPTER}/exercises/${EXERCISE}.c)
 

chapters/1/exercises/23.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include "shared/functions.h"
+#include "shared/functions/uncomment.c"
+
+int main() {
+  char line[MAXLINE];
+  while (uncomment(line,MAXLINE) != EOF) {
+    printf("%s", line);
+  }
+  return 0;
+}

chapters/1/exercises/shared/functions.h

@@ -7,3 +7,4 @@ int getlines(char line[], int maxline);
 int detab(char s[],int lim, int col);
 int entab(char s[], int lim, int col);
 int fold(char s[], int lim, int cpr);
+int uncomment(char s[],int lim);

chapters/1/exercises/shared/functions/uncomment.c

@@ -0,0 +1,58 @@
+#include <stdio.h>
+
+int com = 0;
+
+/*
+ * TODO:
+ * Keep backbuffer of 1 character (current & i-1) to check for comment ends
+ * Handle double slashes nicely
+ * Find a cleaner way to achieve this
+*/
+
+int uncomment(char s[],int lim) {
+  int c, i, quo = 0, wnl = 0;
+  /* c is character integer
+   * i is column
+   * com is current comment state
+   * quo is current quote state */
+  for (i=0; i < lim-1 && (c=getchar())!=EOF && c!='\n'; ++i) {
+    /* Check if we are in a character constant or between quotes, if yes ignore comments */
+    if (c == '"' || (c == '\'' && s[i-1] != '"')) {
+      if (quo == 1) {
+        quo = 0; //test
+      } else {
+        quo = 1;
+      }
+    } else if (quo == 0 && (c == '/' || c == '*')) {
+      if (com == 0) {
+        if (c == '*' && s[i-1] == '/') {
+          com = 1;
+        } else if (c == '/' && s[i-1] == '/') {
+          wnl = 1;
+          s[i-1] = ' ';
+        }
+      } else if (com == 1 && c == '/' && s[i-1] == '*') {
+        com = 0;
+      }
+    }
+    if (com == 0 && wnl == 0) {
+      s[i] = c;
+    } else {
+      s[i] = ' ';
+    }
+  }
+  /* If the line is completly empty, do not print a new line, jump to the next line */
+  for (;i > 0 && (s[i-1] == ' ' || s[i-1] == '\t'); i--);
+  if (i == 0) {
+    s[i] = '\0';
+  } else {
+    s[i] = '\n';
+    s[i+1] = '\0';
+  }
+  /* If we have hit the end of the line, tell the previous function, else return the lenght */
+  if (c == EOF) {
+    return EOF;
+  } else {
+    return i;
+  }
+}