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author | The Android Open Source Project <initial-contribution@android.com> | 2008-10-21 07:00:00 -0700 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2008-10-21 07:00:00 -0700 |
commit | 4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 (patch) | |
tree | 54fd1b2695a591d2306d41264df67c53077b752c /sh/mystring.c | |
download | system_core-4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53.zip system_core-4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53.tar.gz system_core-4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53.tar.bz2 |
Initial Contribution
Diffstat (limited to 'sh/mystring.c')
-rw-r--r-- | sh/mystring.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/sh/mystring.c b/sh/mystring.c new file mode 100644 index 0000000..aecf83e --- /dev/null +++ b/sh/mystring.c @@ -0,0 +1,133 @@ +/* $NetBSD: mystring.c,v 1.16 2003/08/07 09:05:35 agc Exp $ */ + +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#ifndef lint +#if 0 +static char sccsid[] = "@(#)mystring.c 8.2 (Berkeley) 5/4/95"; +#else +__RCSID("$NetBSD: mystring.c,v 1.16 2003/08/07 09:05:35 agc Exp $"); +#endif +#endif /* not lint */ + +/* + * String functions. + * + * equal(s1, s2) Return true if strings are equal. + * scopy(from, to) Copy a string. + * scopyn(from, to, n) Like scopy, but checks for overflow. + * number(s) Convert a string of digits to an integer. + * is_number(s) Return true if s is a string of digits. + */ + +#include <stdlib.h> +#include "shell.h" +#include "syntax.h" +#include "error.h" +#include "mystring.h" + + +char nullstr[1]; /* zero length string */ + +/* + * equal - #defined in mystring.h + */ + +/* + * scopy - #defined in mystring.h + */ + + +/* + * scopyn - copy a string from "from" to "to", truncating the string + * if necessary. "To" is always nul terminated, even if + * truncation is performed. "Size" is the size of "to". + */ + +void +scopyn(const char *from, char *to, int size) +{ + + while (--size > 0) { + if ((*to++ = *from++) == '\0') + return; + } + *to = '\0'; +} + + +/* + * prefix -- see if pfx is a prefix of string. + */ + +int +prefix(const char *pfx, const char *string) +{ + while (*pfx) { + if (*pfx++ != *string++) + return 0; + } + return 1; +} + + +/* + * Convert a string of digits to an integer, printing an error message on + * failure. + */ + +int +number(const char *s) +{ + + if (! is_number(s)) + error("Illegal number: %s", s); + return atoi(s); +} + + + +/* + * Check for a valid number. This should be elsewhere. + */ + +int +is_number(const char *p) +{ + do { + if (! is_digit(*p)) + return 0; + } while (*++p != '\0'); + return 1; +} |