325 lines
7.5 KiB
C
325 lines
7.5 KiB
C
/*
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* Copyright (c) 1999-2002 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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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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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: strl.c,v 1.1.1.2 2002/04/10 03:04:56 gshapiro Exp $")
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#include <sm/config.h>
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#include <sm/string.h>
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/*
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** Notice: this file is used by libmilter. Please try to avoid
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** using libsm specific functions.
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*/
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/*
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** XXX the type of the length parameter has been changed
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** from size_t to ssize_t to avoid theoretical problems with negative
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** numbers passed into these functions.
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** The real solution to this problem is to make sure that this doesn't
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** happen, but for now we'll use this workaround.
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*/
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/*
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** SM_STRLCPY -- size bounded string copy
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**
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** This is a bounds-checking variant of strcpy.
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** If size > 0, copy up to size-1 characters from the nul terminated
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** string src to dst, nul terminating the result. If size == 0,
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** the dst buffer is not modified.
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** Additional note: this function has been "tuned" to run fast and tested
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** as such (versus versions in some OS's libc).
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**
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** The result is strlen(src). You can detect truncation (not all
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** of the characters in the source string were copied) using the
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** following idiom:
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**
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** char *s, buf[BUFSIZ];
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** ...
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** if (sm_strlcpy(buf, s, sizeof(buf)) >= sizeof(buf))
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** goto overflow;
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**
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** Parameters:
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** dst -- destination buffer
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** src -- source string
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** size -- size of destination buffer
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**
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** Returns:
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** strlen(src)
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*/
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size_t
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sm_strlcpy(dst, src, size)
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register char *dst;
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register const char *src;
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ssize_t size;
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{
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register ssize_t i;
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if (size-- <= 0)
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return strlen(src);
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for (i = 0; i < size && (dst[i] = src[i]) != 0; i++)
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continue;
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dst[i] = '\0';
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if (src[i] == '\0')
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return i;
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else
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return i + strlen(src + i);
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}
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/*
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** SM_STRLCAT -- size bounded string concatenation
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**
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** This is a bounds-checking variant of strcat.
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** If strlen(dst) < size, then append at most size - strlen(dst) - 1
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** characters from the source string to the destination string,
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** nul terminating the result. Otherwise, dst is not modified.
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**
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** The result is the initial length of dst + the length of src.
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** You can detect overflow (not all of the characters in the
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** source string were copied) using the following idiom:
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**
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** char *s, buf[BUFSIZ];
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** ...
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** if (sm_strlcat(buf, s, sizeof(buf)) >= sizeof(buf))
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** goto overflow;
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**
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** Parameters:
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** dst -- nul-terminated destination string buffer
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** src -- nul-terminated source string
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** size -- size of destination buffer
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**
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** Returns:
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** total length of the string tried to create
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** (= initial length of dst + length of src)
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*/
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size_t
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sm_strlcat(dst, src, size)
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register char *dst;
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register const char *src;
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ssize_t size;
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{
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register ssize_t i, j, o;
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o = strlen(dst);
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if (size < o + 1)
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return o + strlen(src);
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size -= o + 1;
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for (i = 0, j = o; i < size && (dst[j] = src[i]) != 0; i++, j++)
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continue;
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dst[j] = '\0';
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if (src[i] == '\0')
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return j;
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else
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return j + strlen(src + i);
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}
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/*
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** SM_STRLCAT2 -- append two strings to dst obeying length and
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** '\0' terminate it
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**
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** strlcat2 will append at most len - strlen(dst) - 1 chars.
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** terminates with '\0' if len > 0
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** dst = dst "+" src1 "+" src2
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** use this instead of sm_strlcat(dst,src1); sm_strlcat(dst,src2);
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** for better speed.
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**
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** Parameters:
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** dst -- "destination" string.
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** src1 -- "from" string 1.
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** src2 -- "from" string 2.
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** len -- max. length of "destination" string.
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**
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** Returns:
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** total length of the string tried to create
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** (= initial length of dst + length of src)
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** if this is greater than len then an overflow would have
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** occurred.
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**
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*/
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size_t
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sm_strlcat2(dst, src1, src2, len)
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register char *dst;
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register const char *src1;
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register const char *src2;
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ssize_t len;
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{
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register ssize_t i, j, o;
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/* current size of dst */
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o = strlen(dst);
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/* max. size is less than current? */
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if (len < o + 1)
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return o + strlen(src1) + strlen(src2);
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len -= o + 1; /* space left in dst */
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/* copy the first string; i: index in src1; j: index in dst */
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for (i = 0, j = o; i < len && (dst[j] = src1[i]) != 0; i++, j++)
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continue;
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/* src1: end reached? */
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if (src1[i] != '\0')
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{
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/* no: terminate dst; there is space since i < len */
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dst[j] = '\0';
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return j + strlen(src1 + i) + strlen(src2);
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}
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len -= i; /* space left in dst */
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/* copy the second string; i: index in src2; j: index in dst */
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for (i = 0; i < len && (dst[j] = src2[i]) != 0; i++, j++)
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continue;
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dst[j] = '\0'; /* terminate dst; there is space since i < len */
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if (src2[i] == '\0')
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return j;
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else
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return j + strlen(src2 + i);
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}
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/*
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** SM_STRLCPYN -- concatenate n strings and assign the result to dst
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** while obeying length and '\0' terminate it
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**
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** dst = src1 "+" src2 "+" ...
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** use this instead of sm_snprintf() for string values
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** and repeated sm_strlc*() calls for better speed.
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**
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** Parameters:
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** dst -- "destination" string.
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** len -- max. length of "destination" string.
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** n -- number of strings
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** strings...
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**
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** Returns:
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** total length of the string tried to create
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** (= initial length of dst + length of src)
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** if this is greater than len then an overflow would have
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** occurred.
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*/
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size_t
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#ifdef __STDC__
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sm_strlcpyn(char *dst, ssize_t len, int n, ...)
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#else /* __STDC__ */
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sm_strlcpyn(dst, len, n, va_alist)
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register char *dst;
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ssize_t len;
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int n;
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va_dcl
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#endif /* __STDC__ */
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{
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register ssize_t i, j;
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char *str;
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SM_VA_LOCAL_DECL
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SM_VA_START(ap, n);
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if (len-- <= 0) /* This allows space for the terminating '\0' */
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{
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i = 0;
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while (n-- > 0)
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i += strlen(SM_VA_ARG(ap, char *));
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SM_VA_END(ap);
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return i;
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}
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j = 0; /* index in dst */
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/* loop through all source strings */
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while (n-- > 0)
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{
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str = SM_VA_ARG(ap, char *);
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/* copy string; i: index in str; j: index in dst */
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for (i = 0; j < len && (dst[j] = str[i]) != 0; i++, j++)
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continue;
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/* str: end reached? */
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if (str[i] != '\0')
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{
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/* no: terminate dst; there is space since j < len */
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dst[j] = '\0';
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j += strlen(str + i);
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while (n-- > 0)
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j += strlen(SM_VA_ARG(ap, char *));
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SM_VA_END(ap);
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return j;
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}
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}
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SM_VA_END(ap);
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dst[j] = '\0'; /* terminate dst; there is space since j < len */
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return j;
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}
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#if 0
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/*
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** SM_STRLAPP -- append string if it fits into buffer.
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**
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** If size > 0, copy up to size-1 characters from the nul terminated
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** string src to dst, nul terminating the result. If size == 0,
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** the dst buffer is not modified.
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**
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** This routine is useful for appending strings in a loop, e.g, instead of
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** s = buf;
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** for (ptr, ptr != NULL, ptr = next->ptr)
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** {
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** (void) sm_strlcpy(s, ptr->string, sizeof buf - (s - buf));
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** s += strlen(s);
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** }
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** replace the loop body with:
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** if (!sm_strlapp(*s, ptr->string, sizeof buf - (s - buf)))
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** break;
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** it's faster...
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**
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** XXX interface isn't completely clear (yet), hence this code is
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** not available.
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**
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**
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** Parameters:
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** dst -- (pointer to) destination buffer
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** src -- source string
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** size -- size of destination buffer
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**
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** Returns:
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** true if strlen(src) < size
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**
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** Side Effects:
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** modifies dst if append succeeds (enough space).
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*/
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bool
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sm_strlapp(dst, src, size)
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register char **dst;
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register const char *src;
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ssize_t size;
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{
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register size_t i;
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if (size-- <= 0)
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return false;
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for (i = 0; i < size && ((*dst)[i] = src[i]) != '\0'; i++)
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continue;
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(*dst)[i] = '\0';
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if (src[i] == '\0')
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{
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*dst += i;
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return true;
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}
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/* undo */
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(*dst)[0] = '\0';
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return false;
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}
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#endif /* 0 */
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