[PATCH 1/2] Teach Git how to parse standard power of 2 suffixes.

Sometimes its necessary to supply a value as a power of two in a
configuration parameter.  In this case the user may want to use
the standard suffixes such as K, KB, KiB, etc. to indicate that
the numerical value should be multiplied by a constant base before
being used.

The new git_config_datasize function can be used in config file
handler functions to obtain a size_t in bytes.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---

 Applies on top of sp/mmap, but was broken out to make it easier
 to apply earlier in case someone else needed this function.

 cache.h  |    1 +
 config.c |   25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/cache.h b/cache.h
index a5fc232..abbcab3 100644
--- a/cache.h
+++ b/cache.h
@@ -418,6 +418,7 @@ extern int git_config_from_file(config_fn_t fn, const char *);
 extern int git_config(config_fn_t fn);
 extern int git_config_int(const char *, const char *);
 extern int git_config_bool(const char *, const char *);
+extern size_t git_config_datasize(const char *, const char *);
 extern int git_config_set(const char *, const char *);
 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 extern int git_config_rename_section(const char *, const char *);
diff --git a/config.c b/config.c
index 2e0d5a8..07ad2f1 100644
--- a/config.c
+++ b/config.c
@@ -255,6 +255,31 @@ int git_config_bool(const char *name, const char *value)
 	return git_config_int(name, value) != 0;
 }
 
+size_t git_config_datasize(const char *name, const char *value)
+{
+	if (value && *value) {
+		char *end;
+		unsigned long val = strtoul(value, &end, 0);
+		while (isspace(*end))
+			end++;
+		if (!*end)
+			return val;
+		if (!strcasecmp(end, "k")
+			|| !strcasecmp(end, "kb")
+			|| !strcasecmp(end, "kib"))
+			return val * 1024;
+		if (!strcasecmp(end, "m")
+			|| !strcasecmp(end, "mb")
+			|| !strcasecmp(end, "mib"))
+			return val * 1024 * 1024;
+		if (!strcasecmp(end, "g")
+			|| !strcasecmp(end, "gb")
+			|| !strcasecmp(end, "gib"))
+			return val * 1024 * 1024 * 1024;
+	}
+	die("bad config value for '%s' in %s", name, config_file_name);
+}
+
 int git_default_config(const char *var, const char *value)
 {
 	/* This needs a better name */
-- 
1.5.0.rc0.g6bb1

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