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rewrite getn() which is some kind of atoi with return code

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costs 1 .text, saves 4 .data, 1 libc import
This commit is contained in:
tg 2006-11-10 02:05:06 +00:00
parent 242d2c086d
commit 658dc2b407
1 changed files with 25 additions and 10 deletions
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35
misc.c
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@ -3,7 +3,7 @@
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.26 2006/11/10 01:52:23 tg Exp $\t"
__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.27 2006/11/10 02:05:06 tg Exp $\t"
MKSH_SH_H_ID);
unsigned char chtypes[UCHAR_MAX + 1]; /* type bits for unsigned char */
@ -415,18 +415,33 @@ parse_args(char **argv,
/* parse a decimal number: returns 0 if string isn't a number, 1 otherwise */
int
getn(const char *as, int *ai)
getn(const char *s, int *ai)
{
char *p;
long n;
int i, c;
bool neg = false;
n = strtol(as, &p, 10);
do {
c = *s++;
} while (isspace(c));
if (c == '-') {
neg = true;
c = *s++;
} else if (c == '+')
c = *s++;
i = 0;
do {
*ai = i;
if (!isdigit(c))
return (0);
i *= 10;
if (i < *ai)
/* overflow */
return (0);
i += c - '0';
} while ((c = *s++));
if (!*as || *p || INT_MIN >= n || n >= INT_MAX)
return 0;
*ai = (int)n;
return 1;
*ai = neg ? -i : i;
return (1);
}
/* getn() that prints error */