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#include <fcntl.h>
#include <stdlib.h>
#define MAXBSIZE 65536
u_long file_wc(char *file)
{
register u_char *p;
register short gotsp;
register int ch, len;
register u_long linect, charct;
int fd;
u_char buf[MAXBSIZE];
if (file) {
if ((fd = open(file, O_RDONLY, 0)) < 0)
return -1;
for (gotsp = 1; len = read(fd, buf, MAXBSIZE);) {
if (len == -1)
return -1;
charct += len;
for (p = buf; len--;) {
ch = *p++;
if (ch == '\n')
++linect;
if (isspace(ch))
gotsp = 1;
else if (gotsp) {
gotsp = 0;
}
}
}
}
return linect;
}
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#include <stdlib.h>
int main(int argc,char *argv[])
{
u_long row;
row= file_wc("test.unl");
printf("%d\n",row);
return 0;
} ......
linux c ¶ÁÈ¡ÎļþÐÐÊý²ÎÕÕwc ϵͳÃüÁî±àдµÄº¯ÊýÈçÏ£º
#include <fcntl.h>
#include <stdlib.h>
#define MAXBSIZE 65536
u_long file_wc(char *file)
{
register u_char *p;
register short gotsp;
register int ch, len;
register u_long linect, charct;
int fd;
u_char buf[MAXBSIZE];
if (file) {
if ((fd = open(file, O_RDONLY, 0)) < 0)
return -1;
for (gotsp = 1; len = read(fd, buf, MAXBSIZE);) {
if (len == -1)
return -1;
charct += len;
for (p = buf; len--;) {
ch = *p++;
if (ch == '\n')
++linect;
if (isspace(ch))
gotsp = 1;
else if (gotsp) {
gotsp = 0;
}
}
}
}
return linect;
}
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#include <stdlib.h>
int main(int argc,char *argv[])
{
u_long row;
row= file_wc("test.unl");
printf("%d\n",row);
return 0;
} ......
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1.ÄÚ´æ¶ÔÆë:¼ÆËã»úϵͳ¶Ô»ù±¾ÀàÐÍÊý¾ÝÔÚÄÚ´æÖдæ·ÅµÄλÖÃÓÐÏÞÖÆ£¬ËüÃÇ»áÒªÇóÕâЩÊý¾ÝµÄÊ×µØÖ·µÄÖµÊÇij¸öÊýk(ͨ³£ËüΪ4»ò8)µÄ±¶ÊýkÔò±»³ÆΪ¸ÃÊý¾ÝÀàÐ͵ĶÔÆëÄ£Êý(alignment modulus)
2.²»Í¬±àÒëÆ÷ĬÈϵÄ×î´ó¶ÔÆë×Ö½ÚÊýÊDz»Ò»ÑùµÄ,±ÈÈçvc==8,gcc==4,¿ÉÒÔͨ¹ý#progma pack (n)À´ÐÞ¸Ä,·ÖÎö³ÌÐòµÄʱºòҪעÒâ±àÒëÆ÷µÄÇø±ð
3.Ò»¸ö½á¹¹ÌåÀïÃæ,°´ÕÕalignment modulus×î´óµÄÊý¾Ý³ÉÔ±À´½øÐжÔÆë,³¬¹ý±àÒëÆ÷¹æ¶¨×î´óµÄ¶ÔÆë×Ö½Ú¸öÊý,°´±àÒëÆ÷×î´ó¶ÔÆë×Ö½Ú¸öÀ´
4.doubleÀàÐÍÔÚvcÀïÃæalignment modulus == 8,¶øÔÚgccÀïÃæÓÉÓÚĬÈÏ×î´ó¶ÔÆë¸öÊýÊÇ4,²»ÉèÖõĻ°,alignment modulus == 4
5.ÒòΪÊý×é¸÷ÔªËØÖ®¼ä²»ÄÜÓпÕ϶,ËùÒÔ{int a;char b;}
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1.ÄÚ´æ¶ÔÆë:¼ÆËã»úϵͳ¶Ô»ù±¾ÀàÐÍÊý¾ÝÔÚÄÚ´æÖдæ·ÅµÄλÖÃÓÐÏÞÖÆ£¬ËüÃÇ»áÒªÇóÕâЩÊý¾ÝµÄÊ×µØÖ·µÄÖµÊÇij¸öÊýk(ͨ³£ËüΪ4»ò8)µÄ±¶ÊýkÔò±»³ÆΪ¸ÃÊý¾ÝÀàÐ͵ĶÔÆëÄ£Êý(alignment modulus)
2.²»Í¬±àÒëÆ÷ĬÈϵÄ×î´ó¶ÔÆë×Ö½ÚÊýÊDz»Ò»ÑùµÄ,±ÈÈçvc==8,gcc==4,¿ÉÒÔͨ¹ý#progma pack (n)À´ÐÞ¸Ä,·ÖÎö³ÌÐòµÄʱºòҪעÒâ±àÒëÆ÷µÄÇø±ð
3.Ò»¸ö½á¹¹ÌåÀïÃæ,°´ÕÕalignment modulus×î´óµÄÊý¾Ý³ÉÔ±À´½øÐжÔÆë,³¬¹ý±àÒëÆ÷¹æ¶¨×î´óµÄ¶ÔÆë×Ö½Ú¸öÊý,°´±àÒëÆ÷×î´ó¶ÔÆë×Ö½Ú¸öÀ´
4.doubleÀàÐÍÔÚvcÀïÃæalignment modulus == 8,¶øÔÚgccÀïÃæÓÉÓÚĬÈÏ×î´ó¶ÔÆë¸öÊýÊÇ4,²»ÉèÖõĻ°,alignment modulus == 4
5.ÒòΪÊý×é¸÷ÔªËØÖ®¼ä²»ÄÜÓпÕ϶,ËùÒÔ{int a;char b;}
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int main()
{
char *name = "fengkewei";
char name1[] = "fengkewei";
char *name2 = "fengkewei";
char *name3 = "woaifengkewei";
int i = 10;
int j = 10;
int k = 11;
return 0;
}
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+ &name 0x0013ff5c unsigned char * *
+ &name1 0x0013ff48 unsigned char [10]*
+ &name2 0x0013ff3c unsigned char * *
+ &name3 0x0013ff30 unsigned char * *
+ &i 0x0013ff24 int *
+ &j 0x0013ff18 int *
+ &k 0x0013ff0c int *
---------------------------------------------------------------
&name ºÍ&name1[] Ïà²î20¸ö×Ö½Ú µ«"fengkewei"Ö»ÓÐ10¸ö×Ö½Ú£¨´ø¿Õ×Ö·û£©
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int main()
{
char *name = "fengkewei";
char name1[] = "fengkewei";
char *name2 = "fengkewei";
char *name3 = "woaifengkewei";
int i = 10;
int j = 10;
int k = 11;
return 0;
}
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+ &name 0x0013ff5c unsigned char * *
+ &name1 0x0013ff48 unsigned char [10]*
+ &name2 0x0013ff3c unsigned char * *
+ &name3 0x0013ff30 unsigned char * *
+ &i 0x0013ff24 int *
+ &j 0x0013ff18 int *
+ &k 0x0013ff0c int *
---------------------------------------------------------------
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