utils: add osmo_str_to_int() and osmo_str_to_int64()
Properly converting a string to an integer while validating against all
possible errors is not trivial. It is a recurring theme in code review,
and there are places in osmo code that do it wrong.
End this by providing a simple API, if for nothing else then as an
example of how to use strol() / strtoul() / strtoll() / strtoull()
in an airtight way.
A subsequent patch, adding stat items to the CTRL interface, uses this
to properly validate indexes in CTRL variables and convert them to int.
Related: SYS#5542
Change-Id: I4dac826aab00bc1780a5258b6b55d34ce7d50c60
diff --git a/include/osmocom/core/utils.h b/include/osmocom/core/utils.h
index 1c60390..85a8cb3 100644
--- a/include/osmocom/core/utils.h
+++ b/include/osmocom/core/utils.h
@@ -283,6 +283,9 @@
int osmo_int_to_float_str_buf(char *buf, size_t buflen, int64_t val, unsigned int precision);
char *osmo_int_to_float_str_c(void *ctx, int64_t val, unsigned int precision);
+int osmo_str_to_int64(int64_t *result, const char *str, int base, int64_t min_val, int64_t max_val);
+int osmo_str_to_int(int *result, const char *str, int base, int min_val, int max_val);
+
/*! Translate a buffer function to a talloc context function.
* This is the full function body of a char *foo_name_c(void *ctx, val...) function, implemented by an
* int foo_name_buf(buf, buflen, val...) function: