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Add strnvis and strnunvis functions

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Taken from OpenBSD.
This commit is contained in:
Guillem Jover
2009-10-24 00:15:57 +02:00
parent 5c078ce2f5
commit 04250f6a7c
4 changed files with 105 additions and 2 deletions
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61
src/vis.c
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@@ -1,3 +1,4 @@
/* $OpenBSD: vis.c,v 1.18 2005/08/29 18:38:41 otto Exp $ */
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
@@ -30,10 +31,20 @@
#include <sys/types.h>
#include <limits.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <vis.h>
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define isvisible(c) \
(((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
(((c) != '*' && (c) != '?' && (c) != '[' && (c) != '#') || \
(flag & VIS_GLOB) == 0) && isgraph((u_char)(c))) || \
((flag & VIS_SP) == 0 && (c) == ' ') || \
((flag & VIS_TAB) == 0 && (c) == '\t') || \
((flag & VIS_NL) == 0 && (c) == '\n') || \
((flag & VIS_SAFE) && ((c) == '\b' || \
(c) == '\007' || (c) == '\r' || \
isgraph((u_char)(c)))))
/*
* vis - visually encode characters
@@ -149,12 +160,15 @@ done:
}
/*
* strvis, strvisx - visually encode characters from src into dst
* strvis, strnvis, strvisx - visually encode characters from src into dst
*
* Dst must be 4 times the size of src to account for possible
* expansion. The length of dst, not including the trailing NUL,
* is returned.
*
* Strnvis will write no more than siz-1 bytes (and will NULL terminate).
* The number of bytes needed to fully encode the string is returned.
*
* Strvisx encodes exactly len bytes from src into dst.
* This is useful for encoding a block of data.
*/
@@ -174,6 +188,49 @@ strvis(dst, src, flag)
}
int
strnvis(char *dst, const char *src, size_t siz, int flag)
{
char *start, *end;
char tbuf[5];
int c, i;
i = 0;
for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
if (isvisible(c)) {
i = 1;
*dst++ = c;
if (c == '\\' && (flag & VIS_NOSLASH) == 0) {
/* need space for the extra '\\' */
if (dst < end)
*dst++ = '\\';
else {
dst--;
i = 2;
break;
}
}
src++;
} else {
i = vis(tbuf, c, flag, *++src) - tbuf;
if (dst + i <= end) {
memcpy(dst, tbuf, i);
dst += i;
} else {
src--;
break;
}
}
}
if (siz > 0)
*dst = '\0';
if (dst + i > end) {
/* adjust return value for truncation */
while ((c = *src))
dst += vis(tbuf, c, flag, *++src) - tbuf;
}
return (dst - start);
}
strvisx(dst, src, len, flag)
char *dst;
const char *src;