Mercurial > cpython-lru_cache-weakref
annotate Python/atof.c @ 49955:878d40468c4e legacy-trunk
Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
| author | Vinay Sajip <vinay_sajip@yahoo.co.uk> |
|---|---|
| date | Wed, 03 Dec 2008 23:22:58 +0000 |
| parents | 2dea40e40d9d |
| children | fd25030223b0 |
| rev | line source |
|---|---|
| 2396 | 1 |
| 2 /* Just in case you haven't got an atof() around... | |
| 3 This one doesn't check for bad syntax or overflow, | |
| 4 and is slow and inaccurate. | |
| 5 But it's good enough for the occasional string literal... */ | |
| 6 | |
|
18835
2dea40e40d9d
Patch #411138: Rename config.h to pyconfig.h. Closes bug #231774.
Martin v. Löwis <martin@v.loewis.de>
parents:
14375
diff
changeset
|
7 #include "pyconfig.h" |
| 2396 | 8 |
| 9 #include <ctype.h> | |
| 10 | |
|
13658
f79434ee41fa
Mass ANSIfication of function definitions. Doesn't cover all 'extern'
Thomas Wouters <thomas@python.org>
parents:
13256
diff
changeset
|
11 double atof(char *s) |
| 2396 | 12 { |
| 13 double a = 0.0; | |
| 14 int e = 0; | |
| 15 int c; | |
| 16 while ((c = *s++) != '\0' && isdigit(c)) { | |
| 17 a = a*10.0 + (c - '0'); | |
| 18 } | |
| 19 if (c == '.') { | |
| 20 while ((c = *s++) != '\0' && isdigit(c)) { | |
| 21 a = a*10.0 + (c - '0'); | |
| 22 e = e-1; | |
| 23 } | |
| 24 } | |
| 25 if (c == 'e' || c == 'E') { | |
| 26 int sign = 1; | |
| 27 int i = 0; | |
| 28 c = *s++; | |
| 29 if (c == '+') | |
| 30 c = *s++; | |
| 31 else if (c == '-') { | |
| 32 c = *s++; | |
| 33 sign = -1; | |
| 34 } | |
| 35 while (isdigit(c)) { | |
| 36 i = i*10 + (c - '0'); | |
| 37 c = *s++; | |
| 38 } | |
| 39 e += i*sign; | |
| 40 } | |
| 41 while (e > 0) { | |
| 42 a *= 10.0; | |
| 43 e--; | |
| 44 } | |
| 45 while (e < 0) { | |
| 46 a *= 0.1; | |
| 47 e++; | |
| 48 } | |
| 49 return a; | |
| 50 } |