Mercurial > cpython-lru_cache-weakref
annotate Python/atof.c @ 44825:ef859cd754a7 legacy-trunk
Fixed a wrong assumption in configure.in and Include/pyport.h. The is finite function is not called isfinite() but finite(). Sorry, my fault. :)
| author | Christian Heimes <christian@cheimes.de> |
|---|---|
| date | Sun, 20 Jan 2008 14:28:28 +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 } |