ulib.c

#include "types.h"
#include "stat.h"
#include "fcntl.h"
#include "user.h"
#include "x86.h"

char *
strcpy (char *s, char *t)
{
    char *os;

    os = s;
    while ((*s++ = *t++) != 0)
        ;
    return os;
}

int
strcmp (const char *p, const char *q)
{
    while (*p && *p == *q)
        p++, q++;
    return (uchar) * p - (uchar) * q;
}

uint
strlen (char *s)
{
    int n;

    for (n = 0; s[n]; n++)
        ;
    return n;
}

void *
memset (void *dst, int c, uint n)
{
    stosb (dst, c, n);
    return dst;
}

char *
strchr (const char *s, char c)
{
    for (; *s; s++)
        if (*s == c)
            return (char *) s;
    return 0;
}

char *
gets (char *buf, int max)
{
    int i, cc;
    char c;

    for (i = 0; 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;
}

int
stat (char *n, struct stat *st)
{
    int fd;
    int r;

    fd = open (n, O_RDONLY);
    if (fd < 0)
        return -1;
    r = fstat (fd, st);
    close (fd);
    return r;
}

int
atoi (const char *s)
{
    int n;

    n = 0;
    while ('0' <= *s && *s <= '9')
        n = n * 10 + *s++ - '0';
    return n;
}

void *
memmove (void *vdst, void *vsrc, int n)
{
    char *dst, *src;

    dst = vdst;
    src = vsrc;
    while (n-- > 0)
        *dst++ = *src++;
    return vdst;
}