def grep(pattern, fd):
m = 0
buf = " " * 1024
# while (n = read(fd, buf+m, sizeof(buf)-m)) > 0
while True:
n, s = read(fd, 1024 - m)
buf = buf[:m] + s
if n <= 0:
break
m += n
p = buf
# while (q = strchr(p, '\n')) != 0
while True:
q = strchr(p, "\n")
if q == 0:
break
q = "\0" + q[1:]
if match(pattern, p):
q = "\n" + q[1:]
write(1, p, len(p) + 1 - len(q))
p = q[1:]
if p == buf:
m = 0
if m > 0:
m -= len(p) - len(buf)
# memmove(buf, p, m)
buf = p[:m] + buf[m:]
def cat(fd):
# while((n = read(fd, buf, sizeof(buf))) > 0)
while True:
n, buf = read(fd, 512)
if n <= 0:
break
write(1, buf, n)
if n < 0:
printf(1, "cat: read error\n") # @@@ should that be 2?
exit_(1)
def writetest():
printf(stdout, "small file test\n")
fd = open_("small", O_CREATE | O_RDWR)
if fd >= 0:
printf(stdout, "creat small succeeded; ok\n")
else:
printf(stdout, "error: creat small failed!\n")
exit_()
for i in range(100):
if write(fd, "aaaaaaaaaa", 10) != 10:
printf(stdout, "error: write aa %d new file failed\n", i)
exit_()
if write(fd, "bbbbbbbbbb", 10) != 10:
printf(stdout, "error: write bb %d new file failed\n", i)
exit_()
printf(stdout, "writes ok\n")
close(fd)
fd = open_("small", O_RDONLY)
if fd >= 0:
printf(stdout, "open small succeeded ok\n")
else:
printf(stdout, "error: open small failed!\n")
exit_()
i, buf = read(fd, 2000)
if i == 2000:
printf(stdout, "read succeeded ok\n")
else:
printf(stdout, "read failed\n")
exit_()
close(fd)
if unlink("small") < 0:
printf(stdout, "unlink small failed\n")
exit_()
printf(stdout, "small file test ok\n")
def writetest1():
buf = "\0" * 2048
printf(stdout, "big files test\n")
fd = open_("big", O_CREATE | O_RDWR)
if fd < 0:
printf(stdout, "error: creat big failed!\n")
exit_()
for i in range(MAXFILE):
buf = chr(i % 256) + buf[1:]
if write(fd, buf, 512) != 512:
printf(stdout, "error: write big file failed\n", i)
exit_()
close(fd)
fd = open_("big", O_RDONLY)
if fd < 0:
printf(stdout, "error: open big failed!\n")
exit_()
n = 0
while True:
i, buf = read(fd, 512)
if i == 0:
if n == MAXFILE - 1:
printf(stdout, "read only %d blocks from big", n)
exit_()
break
elif i != 512:
printf(stdout, "read failed %d\n", i)
exit_()
if buf[0] != chr(n % 256):
printf(stdout, "read content of block %d is %d\n", n, buf[0])
exit_()
n += 1
close(fd)
if unlink("big") < 0:
printf(stdout, "unlink big failed\n")
exit_()
printf(stdout, "big files ok\n")
def putc(fd, c):
write(fd, c, 1)