inital commit

1 files changed, 161 insertions, 0 deletions

diff --git a/1.24.c b/1.24.c
new file mode 100644
index 0000000..5e24942
--- /dev/null
+++ b/1.24.c
@@ -0,0 +1,161 @@
+#include <stdio.h>
+
+#define OUT 0
+#define FALSE -1
+#define TRUE 1
+#define STAR 1
+#define SLASH 2
+
+void count(char input, int* parentheses, int* brackets, int* braces);
+
+/* this is a c programm to detect syntax errors in c programms */
+
+int 
+main(void)
+{
+  char input;
+  int temp, state, line, parentheses, brackets, braces, single_quotes, double_quotes, double_quotes_line;
+
+  state = OUT;
+  parentheses = brackets = braces = single_quotes = double_quotes = double_quotes_line = 0;
+  line = 1;
+
+  while ((input = getchar()) != EOF) {
+
+    if (input == '\n') {
+      line++;
+      continue;
+    }
+
+    /* filiter out comments */
+
+    else if (input == '/') {
+       temp = input;
+
+      if ((input = getchar()) == '*') {
+        state = STAR;
+        temp = FALSE;
+      } 
+
+      else if (input == '/') {
+        state = SLASH;
+        temp = FALSE;
+      }
+
+    }
+
+    else if (input == '*' && state == STAR) {
+
+      if ((input = getchar()) == '/') {
+        state = OUT;
+        continue;
+      }  
+
+    }
+
+    else if (input == '\n' && state == SLASH) {
+      state = OUT;
+      continue;
+    }
+
+    if (temp != FALSE)
+      count(temp, &parentheses, &brackets, &braces);
+
+    if (state == OUT) {
+
+      if (input == '"' && double_quotes == TRUE) {
+        double_quotes = FALSE;
+        continue;
+      } 
+
+      /* process escape sequences  */
+
+      else if (input == '\\') {
+        input = getchar();
+
+        if (input == '\n') {
+          line++;
+          continue;
+        }
+
+        if (input != 'a' && input != 'b' && input != 'f' && input != 'n' && input != 'r' &&
+            input != 't' && input != 'v' && input != '\\' && input != '\'' && input != '"' && input != '?' && input != '0')
+          printf("unproper escape sequence detected at line %d\n", line);
+        
+        else if (input == 'o') {
+          if((input = getchar()) != 'o' || (input = getchar()) != 'o')
+            printf("unproper escape sequence detected at line %d\n", line);
+        }
+
+        else if (input == 'x') {
+          if((input = getchar()) != 'h' || (input = getchar()) != 'h')
+            printf("unproper escape sequence detected at line %d\n", line);
+        }
+
+        else 
+          continue;
+      }
+
+      /* process double quotes */
+
+      else if (input == '"') {
+        double_quotes = TRUE;
+        double_quotes_line = line;
+      }
+
+      /* process single quotes */ 
+
+      else if (input == '\'' && double_quotes != TRUE) {
+        ;
+        if ((input = getchar()) == '\\') {
+          input = getchar();
+        }
+
+        if ((input = getchar()) != '\'')
+          printf("unproper single quotes detected at line %d\n", line);
+
+        continue;
+      }
+
+      /* process all others */
+
+      count(input, &parentheses, &brackets, &braces);
+    }
+  }
+  
+  if (parentheses%=2)
+    printf("unproper parentheses detected\n");
+  if (brackets%=2)
+    printf("unproper brackets detected\n");
+  if (braces%=2)
+    printf("unproper braces detected\n");
+  if (double_quotes == TRUE)
+    printf("unproper double quotes detected at line %d\n", double_quotes_line);
+
+  return 0;
+}
+
+void 
+count(char input, int* parentheses, int* brackets, int* braces)
+{
+  switch (input) {
+        case '(' :
+          (*parentheses)++;
+          break;
+        case ')' :
+          (*parentheses)--;
+          break;
+        case '[' :
+          (*brackets)++;
+          break;
+        case ']' :
+          (*brackets)--;
+          break;
+        case '{' :
+          (*braces)++;
+          break;
+        case '}' :
+          (*braces)--;
+          break;
+  }
+}