FreeCalypso > hg > freecalypso-tools
annotate target-utils/libc/atoi.c @ 268:081e22784044
CHANGES: fc-fsio pirelli-magnetite-init change documented
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Thu, 16 Nov 2017 04:41:39 +0000 |
parents | 7fb62fc724dc |
children |
rev | line source |
---|---|
87
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
1 atoi(p) |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
2 register char *p; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
3 { |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
4 register int n; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
5 register int f; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
6 |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
7 n = 0; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
8 f = 0; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
9 for(;;p++) { |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
10 switch(*p) { |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
11 case ' ': |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
12 case '\t': |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
13 continue; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
14 case '-': |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
15 f++; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
16 case '+': |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
17 p++; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
18 } |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
19 break; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
20 } |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
21 while(*p >= '0' && *p <= '9') |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
22 n = n*10 + *p++ - '0'; |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
23 return(f? -n: n); |
7fb62fc724dc
target-utils/libc: beginning of newlib-ectomy
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
24 } |