1 /* ========================================================================
2 * Copyright 1988-2006 University of Washington
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 *
11 * ========================================================================
12 */
13
14 /*
15 * Program: UNIX/VMS newline routines
16 *
17 * Author: Mark Crispin
18 * Networks and Distributed Computing
19 * Computing & Communications
20 * University of Washington
21 * Administration Building, AG-44
22 * Seattle, WA 98195
23 * Internet: MRC@CAC.Washington.EDU
24 *
25 * Date: 1 August 1988
26 * Last Edited: 30 August 2006
27 */
28
29 /* Copy string with CRLF newlines
30 * Accepts: destination string
31 * pointer to size of destination string buffer
32 * source string
33 * length of source string
34 * Returns: length of copied string
35 */
36
strcrlfcpy(unsigned char ** dst,unsigned long * dstl,unsigned char * src,unsigned long srcl)37 unsigned long strcrlfcpy (unsigned char **dst,unsigned long *dstl,
38 unsigned char *src,unsigned long srcl)
39 {
40 long i = srcl * 2,j;
41 unsigned char c,*d = src;
42 if (*dst) { /* candidate destination provided? */
43 /* count NLs if doesn't fit worst-case */
44 if (i > *dstl) for (i = j = srcl; j; --j) if (*d++ == '\012') i++;
45 /* still too small, must reset destination */
46 if (i > *dstl) fs_give ((void **) dst);
47 }
48 /* make a new buffer if needed */
49 if (!*dst) *dst = (unsigned char *) fs_get ((*dstl = i) + 1);
50 d = *dst; /* destination string */
51 if (srcl) do { /* main copy loop */
52 if ((c = *src++) < '\016') {
53 /* prepend CR to LF */
54 if (c == '\012') *d++ = '\015';
55 /* unlikely CR */
56 else if ((c == '\015') && (srcl > 1) && (*src == '\012')) {
57 *d++ = c; /* copy the CR */
58 c = *src++; /* grab the LF */
59 --srcl; /* adjust the count */
60 }
61 }
62 *d++ = c; /* copy character */
63 } while (--srcl);
64 *d = '\0'; /* tie off destination */
65 return d - *dst; /* return length */
66 }
67
68 /* Length of string after strcrlfcpy applied
69 * Accepts: source string
70 * Returns: length of string
71 */
72
strcrlflen(STRING * s)73 unsigned long strcrlflen (STRING *s)
74 {
75 unsigned long pos = GETPOS (s);
76 unsigned long i = SIZE (s);
77 unsigned long j = i;
78 while (j--) switch (SNX (s)) {/* search for newlines */
79 case '\015': /* unlikely carriage return */
80 if (j && (CHR (s) == '\012')) {
81 SNX (s); /* eat the line feed */
82 j--;
83 }
84 break;
85 case '\012': /* line feed? */
86 i++;
87 default: /* ordinary character */
88 break;
89 }
90 SETPOS (s,pos); /* restore old position */
91 return i;
92 }
93