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Diffstat (limited to '')
| -rw-r--r-- | libmisc/getrange.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/libmisc/getrange.c b/libmisc/getrange.c new file mode 100644 index 0000000..9b5e611 --- /dev/null +++ b/libmisc/getrange.c @@ -0,0 +1,124 @@ +/* + * Copyright (c) 2008 , Nicolas François + * All rights reserved. + * + * 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. The name of the copyright holders or contributors may not be used to + * endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT + * HOLDERS 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 <config.h> + +#ident "$Id: $" + +#include <ctype.h> +#include <stdlib.h> + +#include "defines.h" +#include "prototypes.h" + +/* + * Parse a range and indicate if the range is valid. + * Valid ranges are in the form: + * <long> -> min=max=long has_min has_max + * -<long> -> max=long !has_min has_max + * <long>- -> min=long has_min !has_max + * <long1>-<long2> -> min=long1 max=long2 has_min has_max + * + * If the range is valid, getrange returns 1. + * If the range is not valid, getrange returns 0. + */ +int getrange (char *range, + unsigned long *min, bool *has_min, + unsigned long *max, bool *has_max) +{ + char *endptr; + unsigned long n; + + if (NULL == range) { + return 0; + } + + if ('-' == range[0]) { + if (!isdigit(range[1])) { + /* invalid */ + return 0; + } + errno = 0; + n = strtoul (&range[1], &endptr, 10); + if (('\0' != *endptr) || (ERANGE == errno)) { + /* invalid */ + return 0; + } + /* -<long> */ + *has_min = false; + *has_max = true; + *max = n; + } else { + errno = 0; + n = strtoul (range, &endptr, 10); + if (ERANGE == errno) { + /* invalid */ + return 0; + } + switch (*endptr) { + case '\0': + /* <long> */ + *has_min = true; + *has_max = true; + *min = n; + *max = n; + break; + case '-': + endptr++; + if ('\0' == *endptr) { + /* <long>- */ + *has_min = true; + *has_max = false; + *min = n; + } else if (!isdigit (*endptr)) { + /* invalid */ + return 0; + } else { + *has_min = true; + *min = n; + errno = 0; + n = strtoul (endptr, &endptr, 10); + if ( ('\0' != *endptr) + || (ERANGE == errno)) { + /* invalid */ + return 0; + } + /* <long>-<long> */ + *has_max = true; + *max = n; + } + break; + default: + return 0; + } + } + + return 1; +} + |