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[Contribs] Add command-line utility for looking up gPXE error codes.
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stefanha authored and Michael Brown committed May 20, 2008
1 parent 30cd348 commit 43b0423
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66 changes: 66 additions & 0 deletions contrib/errcode/build_errcodedb.py
@@ -0,0 +1,66 @@
#!/usr/bin/env python
import sys
import re

pxenv_status_files = ('../../src/include/errno.h', )
errfile_files = ('../../src/include/gpxe/errfile.h',
'../../src/arch/i386/include/bits/errfile.h')
posix_errno_files = ('../../src/include/errno.h', )

PXENV_STATUS_RE = re.compile(r'^#define\s+(PXENV_STATUS_[^\s]+)\s+(.+)$')
ERRFILE_RE = re.compile(r'^#define\s+(ERRFILE_[^\s]+)\s+(.+)$')
POSIX_ERRNO_RE = re.compile(r'^#define\s+(E[A-Z]+)\s+.*(0x[0-9a-f]+).*$')

def err(msg):
sys.stderr.write('%s: %s\n' % (sys.argv[0], msg))
sys.exit(1)

def load_header_file(filename, regexp):
defines = {}
for line in open(filename, 'r'):
m = regexp.match(line)
if m:
key, val = m.groups()
defines[key] = val
return defines

def evaluate(defines, expr):
pyexpr = ''
for token in expr.split():
if token in '()':
pass
elif token.startswith('/*') or token.startswith('//'):
break
elif token.startswith('0x') or token == '|':
pyexpr += token
else:
if token in defines:
pyexpr += '0x%x' % defines[token]
else:
return -1
if not re.match(r'^[0-9a-zA-Z_|]+$', pyexpr):
err('invalid expression')
return eval(pyexpr)

def build(filenames, regexp):
unevaluated = {}
for filename in filenames:
unevaluated.update(load_header_file(filename, regexp))

evaluated = {}
changed = True
while changed:
changed = False
for key in list(unevaluated.keys()):
val = evaluate(evaluated, unevaluated[key])
if val != -1:
del unevaluated[key]
evaluated[key] = val
changed = True
if unevaluated:
err('unable to evaluate all #defines')
return evaluated

print 'pxenv_status =', repr(build(pxenv_status_files, PXENV_STATUS_RE))
print 'errfile =', repr(build(errfile_files, ERRFILE_RE))
print 'posix_errno =', repr(build(posix_errno_files, POSIX_ERRNO_RE))
63 changes: 63 additions & 0 deletions contrib/errcode/errcode.py
@@ -0,0 +1,63 @@
#!/usr/bin/env python
import sys

try:
import errcodedb
except ImportError:
sys.stderr.write('Please run this first: ./build_errcodedb.py >errcodedb.py\n')
sys.exit(1)

def to_pxenv_status(errno):
return errno & 0xff

def to_uniq(errno):
return (errno >> 8) & 0x1f

def to_errfile(errno):
return (errno >> 13) & 0x7ff

def to_posix_errno(errno):
return (errno >> 24) & 0x7f

def lookup_errno_component(defines, selector, component):
for key, val in defines.iteritems():
if selector(val) == component:
return key
return '0x%x' % component

class Errno(object):
def __init__(self, errno):
self.pxenv_status = to_pxenv_status(errno)
self.uniq = to_uniq(errno)
self.errfile = to_errfile(errno)
self.posix_errno = to_posix_errno(errno)

def rawstr(self):
return 'pxenv_status=0x%x uniq=%d errfile=0x%x posix_errno=0x%x' % (self.pxenv_status, self.uniq, self.errfile, self.posix_errno)

def prettystr(self):
return 'pxenv_status=%s uniq=%d errfile=%s posix_errno=%s' % (
lookup_errno_component(errcodedb.pxenv_status, to_pxenv_status, self.pxenv_status),
self.uniq,
lookup_errno_component(errcodedb.errfile, to_errfile, self.errfile),
lookup_errno_component(errcodedb.posix_errno, to_posix_errno, self.posix_errno)
)

def __str__(self):
return self.prettystr()

def usage():
sys.stderr.write('usage: %s ERROR_NUMBER\n' % sys.argv[0])
sys.exit(1)

if __name__ == '__main__':
if len(sys.argv) != 2:
usage()

try:
errno = int(sys.argv[1], 16)
except ValueError:
usage()

print Errno(errno)
sys.exit(0)

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