xv6-cs450/ulib.c

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C
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#include "types.h"
#include "stat.h"
#include "fcntl.h"
#include "user.h"
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int
puts(char *s)
{
return write(1, s, strlen(s));
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}
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char*
strcpy(char *s, char *t)
{
char *os;
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os = s;
while((*s++ = *t++) != 0)
;
return os;
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}
int
strcmp(const char *p, const char *q)
{
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while(*p && *p == *q)
p++, q++;
return (uchar)*p - (uchar)*q;
}
uint
strlen(char *s)
{
int n = 0;
for(n = 0; s[n]; n++)
;
return n;
}
void*
memset(void *dst, int c, uint n)
{
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char *d = (char*) dst;
while(n-- > 0)
*d++ = c;
return dst;
}
char*
strchr(const char *s, char c)
{
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for(; *s; s++)
if(*s == c)
return (char*) s;
return 0;
}
char*
gets(char *buf, int max)
{
int i = 0, cc;
char c;
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while(i+1 < max){
cc = read(0, &c, 1);
if(cc < 1)
break;
buf[i++] = c;
if(c == '\n' || c == '\r')
break;
}
buf[i] = '\0';
return buf;
}
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int
stat(char *n, struct stat *st)
{
int fd;
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int r;
fd = open(n, O_RDONLY);
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if(fd < 0)
return -1;
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r = fstat(fd, st);
close(fd);
return r;
}
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int
atoi(const char *s)
{
int n;
n = 0;
while('0' <= *s && *s <= '9')
n = n*10 + *s++ - '0';
return n;
}