diff options
Diffstat (limited to 'lib/common')
| -rw-r--r-- | lib/common/Makemodule.am | 2 | ||||
| -rw-r--r-- | lib/common/parse_size.c | 72 |
2 files changed, 73 insertions, 1 deletions
diff --git a/lib/common/Makemodule.am b/lib/common/Makemodule.am index 635c342..ac1a4e9 100644 --- a/lib/common/Makemodule.am +++ b/lib/common/Makemodule.am @@ -5,7 +5,7 @@ libcommon_a_SOURCES += lib/common/compress.c lib/common/comp_opt.c libcommon_a_SOURCES += lib/common/data_writer.c include/common.h libcommon_a_SOURCES += lib/common/get_path.c lib/common/io_stdin.c libcommon_a_SOURCES += lib/common/writer.c lib/common/perror.c -libcommon_a_SOURCES += lib/common/mkdir_p.c +libcommon_a_SOURCES += lib/common/mkdir_p.c lib/common/parse_size.c libcommon_a_CFLAGS = $(AM_CFLAGS) $(LZO_CFLAGS) if WITH_LZO diff --git a/lib/common/parse_size.c b/lib/common/parse_size.c new file mode 100644 index 0000000..aede38a --- /dev/null +++ b/lib/common/parse_size.c @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * parse_size.c + * + * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at> + */ +#include "common.h" + +#include <ctype.h> +#include <limits.h> + +int parse_size(const char *what, size_t *out, const char *str) +{ + const char *in = str; + size_t acc = 0, x; + + if (!isdigit(*in)) + goto fail_nan; + + while (isdigit(*in)) { + x = *(in++) - '0'; + + if (SZ_MUL_OV(acc, 10, &acc)) + goto fail_ov; + + if (SZ_ADD_OV(acc, x, &acc)) + goto fail_ov; + } + + switch (*in) { + case 'k': + case 'K': + if (acc > ((1UL << (SIZEOF_SIZE_T * CHAR_BIT - 10)) - 1UL)) + goto fail_ov; + acc <<= 10; + ++in; + break; + case 'm': + case 'M': + if (acc > ((1UL << (SIZEOF_SIZE_T * CHAR_BIT - 20)) - 1UL)) + goto fail_ov; + acc <<= 20; + ++in; + break; + case 'g': + case 'G': + if (acc > ((1UL << (SIZEOF_SIZE_T * CHAR_BIT - 30)) - 1UL)) + goto fail_ov; + acc <<= 30; + ++in; + break; + case '\0': + break; + default: + goto fail_suffix; + } + + if (*in != '\0') + goto fail_suffix; + + *out = acc; + return 0; +fail_nan: + fprintf(stderr, "%s: '%s' is not a number.\n", what, str); + return -1; +fail_ov: + fprintf(stderr, "%s: numeric overflow parsing '%s'.\n", what, str); + return -1; +fail_suffix: + fprintf(stderr, "%s: unknown suffix in '%s'.\n", what, str); + return -1; +} |