xv6

port of xv6 to x86-64
git clone http://frotz.net/git/xv6.git
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ulib.c (1245B)

      1 #include "types.h"
      2 #include "stat.h"
      3 #include "fcntl.h"
      4 #include "user.h"
      5 #include "x86.h"
      6 
      7 char*
      8 strcpy(char *s, char *t)
      9 {
     10   char *os;
     11 
     12   os = s;
     13   while((*s++ = *t++) != 0)
     14     ;
     15   return os;
     16 }
     17 
     18 int
     19 strcmp(const char *p, const char *q)
     20 {
     21   while(*p && *p == *q)
     22     p++, q++;
     23   return (uchar)*p - (uchar)*q;
     24 }
     25 
     26 uint
     27 strlen(char *s)
     28 {
     29   int n;
     30 
     31   for(n = 0; s[n]; n++)
     32     ;
     33   return n;
     34 }
     35 
     36 void*
     37 memset(void *dst, int c, uint n)
     38 {
     39   stosb(dst, c, n);
     40   return dst;
     41 }
     42 
     43 char*
     44 strchr(const char *s, char c)
     45 {
     46   for(; *s; s++)
     47     if(*s == c)
     48       return (char*)s;
     49   return 0;
     50 }
     51 
     52 char*
     53 gets(char *buf, int max)
     54 {
     55   int i, cc;
     56   char c;
     57 
     58   for(i=0; i+1 < max; ){
     59     cc = read(0, &c, 1);
     60     if(cc < 1)
     61       break;
     62     buf[i++] = c;
     63     if(c == '\n' || c == '\r')
     64       break;
     65   }
     66   buf[i] = '\0';
     67   return buf;
     68 }
     69 
     70 int
     71 stat(char *n, struct stat *st)
     72 {
     73   int fd;
     74   int r;
     75 
     76   fd = open(n, O_RDONLY);
     77   if(fd < 0)
     78     return -1;
     79   r = fstat(fd, st);
     80   close(fd);
     81   return r;
     82 }
     83 
     84 int
     85 atoi(const char *s)
     86 {
     87   int n;
     88 
     89   n = 0;
     90   while('0' <= *s && *s <= '9')
     91     n = n*10 + *s++ - '0';
     92   return n;
     93 }
     94 
     95 void*
     96 memmove(void *vdst, void *vsrc, int n)
     97 {
     98   char *dst, *src;
     99   
    100   dst = vdst;
    101   src = vsrc;
    102   while(n-- > 0)
    103     *dst++ = *src++;
    104   return vdst;
    105 }