the base is nearly done.
need to implement various comparison functions, now.
This commit is contained in:
John Beppu
parent
019513a59f
commit
f3e59041b5
@ -32,23 +32,26 @@ static const char sort_usage[] =
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"Usage: sort [OPTION]... [FILE]...\n\n"
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;
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/* structs ________________________________________________________________ */
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/* typedefs _______________________________________________________________ */
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/* line node */
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typedef struct {
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char *data; /* line data */
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struct Line *next; /* pointer to next line node */
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typedef struct Line {
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char *data; /* line data */
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struct Line *next; /* pointer to next line node */
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} Line;
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/* singly-linked list of lines */
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typedef struct {
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int len; /* number of Lines */
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Line *sorted; /* array fed to qsort */
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int len; /* number of Lines */
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Line **sorted; /* array fed to qsort */
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Line *head; /* head of List */
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Line *current /* current Line */
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Line *head; /* head of List */
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Line *current; /* current Line */
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} List;
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/* comparison function */
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typedef int (Compare)(const void *, const void *);
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/* methods ________________________________________________________________ */
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@ -105,10 +108,16 @@ line_release(Line *self)
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/* Comparison */
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static int
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compare_ascii(const void *, const void *);
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compare_ascii(const void *a, const void *b)
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{
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return 0;
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}
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static int
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compare_numeric(const void *, const void *);
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compare_numeric(const void *a, const void *b)
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{
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return 0;
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}
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/* List */
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@ -125,7 +134,7 @@ list_init(List *self)
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}
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/* for simplicity, the List gains ownership of the line */
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static void
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static List *
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list_insert(List *self, Line *line)
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{
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if (line == NULL) { return NULL; }
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@ -137,26 +146,54 @@ list_insert(List *self, Line *line)
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/* all subsequent insertions */
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} else {
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self->current->next = line;
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/* <?> the following cast shouldn't be necessary */
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self->current->next = line;
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self->current = line;
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}
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self->len++;
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return self;
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}
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/* */
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/* order the list according to compare() */
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static List *
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list_sort(List *self);
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list_sort(List *self, Compare *compare)
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{
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int i;
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Line *line;
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/* mallocate array of Line*s */
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self->sorted = (Line **) malloc(self->len * sizeof(Line*));
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if (self->sorted == NULL) { return NULL; }
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/* fill array w/ List's contents */
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i = 0;
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line = self->head;
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while (line) {
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self->sorted[i++] = line;
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line = line->next;
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}
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/* apply qsort */
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qsort(self->sorted, sizeof(Line*), self->len, compare);
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return self;
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}
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/* precondition: list must be sorted */
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static List *
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list_writeToFile(List *self, FILE* dst)
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{
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int i;
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Line **line = self->sorted;
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if (self->sorted == NULL) { return NULL; }
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for (i = 0; i < self->len; i++) {
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fprintf(dst, "%s", line[i]->data);
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}
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return self;
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}
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/* deallocate */
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static List *
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static void
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list_release(List *self)
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{
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Line *i;
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@ -166,9 +203,8 @@ list_release(List *self)
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while (i) {
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die = i;
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i = die->next;
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line_delete(die);
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line_release(die);
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}
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return self; /* bad poetry? */
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}
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@ -182,8 +218,10 @@ list_release(List *self)
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int
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sort_main(int argc, char **argv)
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{
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int i;
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char opt;
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int i;
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char opt;
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List list;
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Line *l;
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/* default behaviour */
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@ -204,9 +242,17 @@ sort_main(int argc, char **argv)
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}
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}
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/* initialize list */
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list_init(&list);
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/* go through remaining args (if any) */
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if (i >= argc) {
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while ( (l = line_newFromFile(stdin))) {
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list_insert(&list, l);
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}
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list_sort(&list, compare_ascii);
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list_writeToFile(&list, stdout);
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list_release(&list);
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} else {
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for ( ; i < argc; i++) {
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}
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@ -215,4 +261,9 @@ sort_main(int argc, char **argv)
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exit(0);
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}
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/* $Id: sort.c,v 1.3 1999/12/22 17:57:31 beppu Exp $ */
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/* $Id: sort.c,v 1.4 1999/12/22 22:24:52 beppu Exp $ */
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/* $Log: sort.c,v $
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* Revision 1.4 1999/12/22 22:24:52 beppu
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* the base is nearly done.
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* need to implement various comparison functions, now.
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* */
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93
sort.c
93
sort.c
@ -32,23 +32,26 @@ static const char sort_usage[] =
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"Usage: sort [OPTION]... [FILE]...\n\n"
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;
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/* structs ________________________________________________________________ */
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/* typedefs _______________________________________________________________ */
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/* line node */
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typedef struct {
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char *data; /* line data */
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struct Line *next; /* pointer to next line node */
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typedef struct Line {
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char *data; /* line data */
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struct Line *next; /* pointer to next line node */
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} Line;
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/* singly-linked list of lines */
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typedef struct {
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int len; /* number of Lines */
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Line *sorted; /* array fed to qsort */
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int len; /* number of Lines */
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Line **sorted; /* array fed to qsort */
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Line *head; /* head of List */
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Line *current /* current Line */
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Line *head; /* head of List */
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Line *current; /* current Line */
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} List;
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/* comparison function */
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typedef int (Compare)(const void *, const void *);
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/* methods ________________________________________________________________ */
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@ -105,10 +108,16 @@ line_release(Line *self)
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/* Comparison */
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static int
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compare_ascii(const void *, const void *);
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compare_ascii(const void *a, const void *b)
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{
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return 0;
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}
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static int
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compare_numeric(const void *, const void *);
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compare_numeric(const void *a, const void *b)
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{
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return 0;
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}
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/* List */
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@ -125,7 +134,7 @@ list_init(List *self)
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}
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/* for simplicity, the List gains ownership of the line */
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static void
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static List *
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list_insert(List *self, Line *line)
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{
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if (line == NULL) { return NULL; }
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@ -137,26 +146,54 @@ list_insert(List *self, Line *line)
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/* all subsequent insertions */
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} else {
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self->current->next = line;
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/* <?> the following cast shouldn't be necessary */
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self->current->next = line;
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self->current = line;
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}
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self->len++;
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return self;
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}
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/* */
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/* order the list according to compare() */
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static List *
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list_sort(List *self);
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list_sort(List *self, Compare *compare)
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{
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int i;
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Line *line;
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/* mallocate array of Line*s */
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self->sorted = (Line **) malloc(self->len * sizeof(Line*));
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if (self->sorted == NULL) { return NULL; }
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/* fill array w/ List's contents */
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i = 0;
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line = self->head;
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while (line) {
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self->sorted[i++] = line;
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line = line->next;
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}
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/* apply qsort */
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qsort(self->sorted, sizeof(Line*), self->len, compare);
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return self;
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}
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/* precondition: list must be sorted */
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static List *
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list_writeToFile(List *self, FILE* dst)
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{
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int i;
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Line **line = self->sorted;
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if (self->sorted == NULL) { return NULL; }
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for (i = 0; i < self->len; i++) {
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fprintf(dst, "%s", line[i]->data);
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}
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return self;
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}
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/* deallocate */
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static List *
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static void
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list_release(List *self)
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{
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Line *i;
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@ -166,9 +203,8 @@ list_release(List *self)
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while (i) {
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die = i;
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i = die->next;
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line_delete(die);
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line_release(die);
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}
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return self; /* bad poetry? */
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}
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@ -182,8 +218,10 @@ list_release(List *self)
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int
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sort_main(int argc, char **argv)
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{
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int i;
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char opt;
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int i;
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char opt;
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List list;
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Line *l;
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/* default behaviour */
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@ -204,9 +242,17 @@ sort_main(int argc, char **argv)
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}
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}
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/* initialize list */
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list_init(&list);
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/* go through remaining args (if any) */
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if (i >= argc) {
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while ( (l = line_newFromFile(stdin))) {
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list_insert(&list, l);
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}
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list_sort(&list, compare_ascii);
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list_writeToFile(&list, stdout);
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list_release(&list);
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} else {
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for ( ; i < argc; i++) {
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}
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@ -215,4 +261,9 @@ sort_main(int argc, char **argv)
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exit(0);
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}
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/* $Id: sort.c,v 1.3 1999/12/22 17:57:31 beppu Exp $ */
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/* $Id: sort.c,v 1.4 1999/12/22 22:24:52 beppu Exp $ */
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/* $Log: sort.c,v $
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* Revision 1.4 1999/12/22 22:24:52 beppu
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* the base is nearly done.
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* need to implement various comparison functions, now.
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* */
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