1 files changed, 196 insertions, 0 deletions
diff --git a/wk5/pset/speller/speller.c b/wk5/pset/speller/speller.c
new file mode 100644
index 0000000..39e22eb
--- /dev/null
+++ b/wk5/pset/speller/speller.c
@@ -0,0 +1,196 @@
+// Implements a spell-checker
+
+#include <ctype.h>
+#include <stdio.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+
+#include "dictionary.h"
+
+// Undefine any definitions
+#undef calculate
+#undef getrusage
+
+// Default dictionary
+#define DICTIONARY "dictionaries/large"
+
+// Prototype
+double calculate(const struct rusage *b, const struct rusage *a);
+
+int main(int argc, char *argv[])
+{
+    // Check for correct number of args
+    if (argc != 2 && argc != 3)
+    {
+        printf("Usage: ./speller [DICTIONARY] text\n");
+        return 1;
+    }
+
+    // Structures for timing data
+    struct rusage before, after;
+
+    // Benchmarks
+    double time_load = 0.0, time_check = 0.0, time_size = 0.0, time_unload = 0.0;
+
+    // Determine dictionary to use
+    char *dictionary = (argc == 3) ? argv[1] : DICTIONARY;
+
+    // Load dictionary
+    getrusage(RUSAGE_SELF, &before);
+    bool loaded = load(dictionary);
+    getrusage(RUSAGE_SELF, &after);
+
+    // Exit if dictionary not loaded
+    if (!loaded)
+    {
+        printf("Could not load %s.\n", dictionary);
+        return 1;
+    }
+
+    // Calculate time to load dictionary
+    time_load = calculate(&before, &after);
+
+    // Try to open text
+    char *text = (argc == 3) ? argv[2] : argv[1];
+    FILE *file = fopen(text, "r");
+    if (file == NULL)
+    {
+        printf("Could not open %s.\n", text);
+        unload();
+        return 1;
+    }
+
+    // Prepare to report misspellings
+    printf("\nMISSPELLED WORDS\n\n");
+
+    // Prepare to spell-check
+    int index = 0, misspellings = 0, words = 0;
+    char word[LENGTH + 1];
+
+    // Spell-check each word in text
+    char c;
+    while (fread(&c, sizeof(char), 1, file))
+    {
+        // Allow only alphabetical characters and apostrophes
+        if (isalpha(c) || (c == '\'' && index > 0))
+        {
+            // Append character to word
+            word[index] = c;
+            index++;
+
+            // Ignore alphabetical strings too long to be words
+            if (index > LENGTH)
+            {
+                // Consume remainder of alphabetical string
+                while (fread(&c, sizeof(char), 1, file) && isalpha(c));
+
+                // Prepare for new word
+                index = 0;
+            }
+        }
+
+        // Ignore words with numbers (like MS Word can)
+        else if (isdigit(c))
+        {
+            // Consume remainder of alphanumeric string
+            while (fread(&c, sizeof(char), 1, file) && isalnum(c));
+
+            // Prepare for new word
+            index = 0;
+        }
+
+        // We must have found a whole word
+        else if (index > 0)
+        {
+            // Terminate current word
+            word[index] = '\0';
+
+            // Update counter
+            words++;
+
+            // Check word's spelling
+            getrusage(RUSAGE_SELF, &before);
+            bool misspelled = !check(word);
+            getrusage(RUSAGE_SELF, &after);
+
+            // Update benchmark
+            time_check += calculate(&before, &after);
+
+            // Print word if misspelled
+            if (misspelled)
+            {
+                printf("%s\n", word);
+                misspellings++;
+            }
+
+            // Prepare for next word
+            index = 0;
+        }
+    }
+
+    // Check whether there was an error
+    if (ferror(file))
+    {
+        fclose(file);
+        printf("Error reading %s.\n", text);
+        unload();
+        return 1;
+    }
+
+    // Close text
+    fclose(file);
+
+    // Determine dictionary's size
+    getrusage(RUSAGE_SELF, &before);
+    unsigned int n = size();
+    getrusage(RUSAGE_SELF, &after);
+
+    // Calculate time to determine dictionary's size
+    time_size = calculate(&before, &after);
+
+    // Unload dictionary
+    getrusage(RUSAGE_SELF, &before);
+    bool unloaded = unload();
+    getrusage(RUSAGE_SELF, &after);
+
+    // Abort if dictionary not unloaded
+    if (!unloaded)
+    {
+        printf("Could not unload %s.\n", dictionary);
+        return 1;
+    }
+
+    // Calculate time to unload dictionary
+    time_unload = calculate(&before, &after);
+
+    // Report benchmarks
+    printf("\nWORDS MISSPELLED:     %d\n", misspellings);
+    printf("WORDS IN DICTIONARY:  %d\n", n);
+    printf("WORDS IN TEXT:        %d\n", words);
+    printf("TIME IN load:         %.2f\n", time_load);
+    printf("TIME IN check:        %.2f\n", time_check);
+    printf("TIME IN size:         %.2f\n", time_size);
+    printf("TIME IN unload:       %.2f\n", time_unload);
+    printf("TIME IN TOTAL:        %.2f\n\n",
+           time_load + time_check + time_size + time_unload);
+
+    // Success
+    return 0;
+}
+
+// Returns number of seconds between b and a
+double calculate(const struct rusage *b, const struct rusage *a)
+{
+    if (b == NULL || a == NULL)
+    {
+        return 0.0;
+    }
+    else
+    {
+        return ((((a->ru_utime.tv_sec * 1000000 + a->ru_utime.tv_usec) -
+                  (b->ru_utime.tv_sec * 1000000 + b->ru_utime.tv_usec)) +
+                 ((a->ru_stime.tv_sec * 1000000 + a->ru_stime.tv_usec) -
+                  (b->ru_stime.tv_sec * 1000000 + b->ru_stime.tv_usec)))
+                / 1000000.0);
+    }
+}