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114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
/*
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* Copyright (c) 2000-2001, 2013 Proofpoint, Inc. and its suppliers.
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* All rights reserved.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: fget.c,v 1.26 2013-11-22 20:51:42 ca Exp $")
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#include <stdlib.h>
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#include <string.h>
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#include <sm/io.h>
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#include <sm/assert.h>
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#include "local.h"
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/*
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** SM_IO_FGETS -- get a string from a file
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**
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** Read at most n-1 characters from the given file.
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** Stop when a newline has been read, or the count ('n') runs out.
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**
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** Parameters:
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** fp -- the file to read from
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** timeout -- time to complete reading the string in milliseconds
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** buf -- buffer to place read string in
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** n -- size of 'buf'
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**
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** Returns:
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** success: number of characters
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** failure: -1
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** timeout: -1 and errno set to EAGAIN
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**
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** Side Effects:
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** may move the file pointer
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*/
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int
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sm_io_fgets(fp, timeout, buf, n)
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register SM_FILE_T *fp;
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int timeout;
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char *buf;
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register int n;
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{
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int len, r;
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char *s;
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unsigned char *p, *t;
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SM_REQUIRE_ISA(fp, SmFileMagic);
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if (n <= 0) /* sanity check */
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return -1;
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s = buf;
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n--; /* leave space for NUL */
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r = 0;
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while (n > 0)
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{
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/* If the buffer is empty, refill it. */
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if ((len = fp->f_r) <= 0)
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{
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/*
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** Timeout is only passed if we can't get the data
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** from the buffer (which is counted as immediately).
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*/
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if (sm_refill(fp, timeout) != 0)
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{
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/* EOF/error: stop with partial or no line */
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if (s == buf)
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return -1;
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break;
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}
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len = fp->f_r;
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}
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p = fp->f_p;
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/*
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** Scan through at most n bytes of the current buffer,
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** looking for '\n'. If found, copy up to and including
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** newline, and stop. Otherwise, copy entire chunk
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** and loop.
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*/
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if (len > n)
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len = n;
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t = (unsigned char *) memchr((void *) p, '\n', len);
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if (t != NULL)
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{
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len = ++t - p;
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r += len;
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fp->f_r -= len;
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fp->f_p = t;
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(void) memcpy((void *) s, (void *) p, len);
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s[len] = 0;
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return r;
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}
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fp->f_r -= len;
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fp->f_p += len;
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(void) memcpy((void *) s, (void *) p, len);
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s += len;
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r += len;
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n -= len;
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}
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*s = 0;
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return r;
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}
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