refractored 04-find.c to seperate compilation units

k&r/04-funcs-and-prog-struct/04-find/04-find-no-overflow.c

@@ -3,40 +3,13 @@
 #include <math.h>
 #include <assert.h>
 
-int grep(char pattern[]);
-
-/* grep with graceful buffer overflow */
-/* parse and verify arg pattern, pass it to grep */
-int main(int argc, char *argv[])
-{
-    /* verify arg is given */
-    if (argc < 2) {
-        printf("error: excpected pattern\n");
-        return -1;
-    }
-
-    char *pattern = argv[1];
-
-    /* verify pattern */
-    char c;
-    int i;
-    for (i = 0; (c = pattern[i]) != '\0'; i++)
-        if (c == '\n') {
-            printf("error: newline in pattern\n");
-            return -2;
-        }
-
-    int found = grep(pattern);
-    printf("found = %d\n", found);
-    return found;
-}
-
 void println(void);
 int flush_lnbuff(void);
 int getch_lnbuff(void);
 
-/* grep: prints lines containing pattern, returns number of matching lines */
-int grep(char *pattern)
+/* find: prints lines containing pattern, returns number of matching lines
+ * gracefully handle line overflow */
+int find(char *pattern)
 {
     int found, i, c;
     const int plen = strlen(pattern);

k&r/04-funcs-and-prog-struct/04-find/04-find-opt.c

@@ -3,39 +3,11 @@
 
 #define MAXLINE 1000 /* maximum input line length */
 
-int grep(char *pattern);
-
-/* somewhat optimized book version of grep */
-/* find all lines matching pattern */
-int main(int argc, char *argv[])
-{
-    /* verify arg is given */
-    if (argc < 2) {
-        printf("error: excpected pattern\n");
-        return -1;
-    }
-
-    char *pattern = argv[1];
-
-    /* verify pattern */
-    char c;
-    int i;
-    for (i = 0; (c = pattern[i]) != '\0'; i++)
-        if (c == '\n') {
-            printf("error: newline in pattern\n");
-            return -2;
-        }
-
-    int found = grep(pattern);
-    printf("found = %d\n", found);
-    return found;
-}
-
 int getln(char line[], int lim);
 int strindex(char source[], char searchfor[], int slen);
 
-/* grep: prints lines containing pattern, returns number of matching lines */
-int grep(char *pattern)
+/* find: prints lines containing pattern, returns number of matching lines */
+int find(char *pattern)
 {
     char line[MAXLINE];
     int found = 0;

k&r/04-funcs-and-prog-struct/04-find/04-find.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+/* compile with 04-find-no-overflow.c or 04-find-opt.c
+ * gcc 04-find.c [04-find-no-overflow.c | 04-find-opt.c] */
+
+int find(char *pattern);
+
+/* find pattern given by first arg in lines and print them
+ * compile with 04-find-no-overflow.c or 04-find-opt.c */
+int main(int argc, char *argv[])
+{
+    /* verify arg is given */
+    if (argc < 2) {
+        printf("error: excpected pattern\n");
+        return -1;
+    }
+
+    char *pattern = argv[1];
+
+    /* verify pattern */
+    char c;
+    int i;
+    for (i = 0; (c = pattern[i]) != '\0'; i++)
+        if (c == '\n') {
+            printf("error: newline in pattern\n");
+            return -2;
+        }
+
+    int found = find(pattern);
+    printf("found = %d\n", found);
+    return found;
+}