use positive error return code numbers (#1274)

CHANGELOG.md

@@ -15,7 +15,8 @@
 - don't render all library rule matches in vverbose output #1174 @mr-tz
 
 ### Breaking Changes
-- remove SMDA backend #1062 @williballenthin 
+- remove SMDA backend #1062 @williballenthin
+- error return codes are now positive numbers #1269 @mr-tz
 
 ### New Rules (52)
 

capa/main.py

@@ -73,16 +73,16 @@ SIGNATURES_PATH_DEFAULT_STRING = "(embedded signatures)"
 BACKEND_VIV = "vivisect"
 BACKEND_DOTNET = "dotnet"
 
-E_MISSING_RULES = -10
-E_MISSING_FILE = -11
-E_INVALID_RULE = -12
-E_CORRUPT_FILE = -13
-E_FILE_LIMITATION = -14
-E_INVALID_SIG = -15
-E_INVALID_FILE_TYPE = -16
-E_INVALID_FILE_ARCH = -17
-E_INVALID_FILE_OS = -18
-E_UNSUPPORTED_IDA_VERSION = -19
+E_MISSING_RULES = 10
+E_MISSING_FILE = 11
+E_INVALID_RULE = 12
+E_CORRUPT_FILE = 13
+E_FILE_LIMITATION = 14
+E_INVALID_SIG = 15
+E_INVALID_FILE_TYPE = 16
+E_INVALID_FILE_ARCH = 17
+E_INVALID_FILE_OS = 18
+E_UNSUPPORTED_IDA_VERSION = 19
 
 logger = logging.getLogger("capa")