p_qsort(v, last + 1, right, comp);
}
2)法2
#include
#include
#include
#include
#define NUMERIC 1
#define DECR 2
#define FOLD 4
#define DIR 8
#define MAXLINES 5000
#define MAXLEN 1000
#define MAXSTORAGE 10000
char *lineptr[MAXLINES];
char lines[MAXSTORAGE];
int foldcmp(char *, char *);
int numcmp(char *, char *);
int dircmp(char *, char *);
int folddircmp(char *, char *);
int p_realines(char *lineptr[], int maxlines);
void p_qsort(void *v[], int left, int right, int(*comp)(void *, void *));
void p_writelines(char *lineptr[], int nlines, int order);
static char option = 0;
int main(int argc, char *argv[])
{
int nlines;
int c, rc = 0;
while (--argc > 0 && (*++argv)[0] == -)
{
while (c = *++argv[0])
{
switch(c) {
case d:
option |= DIR;
case f:
option |= FOLD;
break;
case n:
option |= NUMERIC;
break;
case r:
option |= DECR;
break;
default:
printf("sort: illegal option %c\n", c);
argc = 1;
rc = -1;
break;
}
}
}
if (argc)
printf("Usage: sort -fnr\n");
else {
if ((nlines = p_readlines(lineptr, MAXLINES)) > 0) {
if (option & NUMERIC)
p_qsort((void **)lineptr, 0, nlines-1,(int (*)(void *, void *))numcmp);
else if ((option & (FOLD | DIR)) == 0x0c)
{
p_qsort((void **)lineptr, 0, nlines-1, (int (*)(void *, void *))folddircmp);
}
else if (option & FOLD)
p_qsort((void **)lineptr, 0, nlines-1,(int (*)(void *, void *))foldcmp);
else if (option & DIR)
p_qsort((void **)lineptr, 0, nlines-1, (int (*)(void *, void *))dircmp);
else
p_qsort((void **)lineptr, 0, nlines-1, (int (*)(void *, void *))strcmp);
p_writelines(lineptr, nlines, option & DECR);
} else {
printf("Input too big to sort!\n");
rc = -1;
}
}
system("pause");
return rc;
}
int foldcmp(char *s, char *t)
{
char a, b;
int fold = (option & FOLD) ? 1: 0;
do {
a = fold ? tolower(*s): *s;
s++;
b = fold ? tolower(*t): *t;
t++;
if (a == b && a == \0)
return 0;
} while (a == b);
return a - b;
}
int dircmp(char *s, char *t)
{
char a, b;
int dir = (option & DIR) ? 1: 0;
do {
if (dir) {
while (!isalnum(*s) && *s != && *s != \0)
s++;
while (!isalnum(*t) && *t != && *t != \0)
t++;
}
if (a == b && a == \0)
return 0;
} while (a == b);
return a - b;
}
int folddircmp(char *s, char *t)
{
char a, b;
int fold = (option & FOLD) ? 1 : 0;
int dir = (option & DIR) ? 1 : 0;
do {
if (dir) {
while (!isalnum(*s) && *s != && *s != \0)
s++;
while (!isalnum(*t) && *t != && *t != \0)
t++;
}
a = fold ? tolower(*s): *s;
s++;
b = fold ? tolower(*t): *t;
t++;
if (a == b && a == \0)
{
return 0;
}
} while (a == b);
return a - b;
}
int p_readlines(char *lineptr[], int maxlines)
{
int len, nlines;
char *p = lines, line[MAXLEN];
nlines = 0;
printf("Please input a string(# to end input): ");
while ((len = getline(line, MAXLEN)) > 0)
{
if (strcmp(line, "#\n") == 0)
break;
if (nlines >= maxlines || p + len >= lines + MAXSTORAGE)
return -1;
else {
line[len - 1] = \0;
strcpy(p, line);
lineptr[nlines++] = p;
p += len;
}
printf("Please input a string(# to end input): ");
}
return nlines;
}
void p_writelines(char *lineptr[], int nlines, int order)
{
int i;
if (order)
for (i = nlines -1; i >= 0; i--)
printf("%s\n", lineptr[i]);
else
for (i = 0; i < nlines; i++)
printf("%s\n", lineptr[i]);
printf("\n");
