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Fixing validfmt and optimizing the algorithm. (Thanks David Galos)

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This commit is contained in:
Christoph Lohmann 2012-04-18 13:41:05 +02:00
parent dbe8e73237
commit 96b15a5afa
1 changed files with 36 additions and 33 deletions
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69
seq.c
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@ -5,7 +5,6 @@
#include <unistd.h>
#include <stdbool.h>
#include <libgen.h>
#include <regex.h>
#include "util.h"
@ -30,12 +29,12 @@ digitsleft(char *d)
char *exp;
int shift;
if (d[0] == '-' || d[0] == '+')
if (d[0] == '+')
d++;
exp = strpbrk(d, "eE");
shift = exp? atoi(exp+1) : 0;
return MAX(0, strspn(d, "0123456789")+shift);
return MAX(0, strspn(d, "-0123456789")+shift);
}
int
@ -44,8 +43,6 @@ digitsright(char *d)
char *exp;
int shift, after;
if (d[0] == '-' || d[0] == '+')
d++;
exp = strpbrk(d, "eE");
shift = exp ? atoi(exp+1) : 0;
after = (d = strchr(d, '.'))? strspn(d+1, "0123456789") : 0;
@ -56,15 +53,36 @@ digitsright(char *d)
int
validfmt(char *fmt)
{
regex_t reg;
int ret;
int occur;
regcomp(&reg, "\\([^%]|%%\\)*%[0-9]*\\.[0-9]*[fFgG]"
"\\([^%]|%%\\)*", REG_NOSUB);
ret = regexec(&reg, fmt, 0, NULL, 0);
regfree(&reg);
occur = 0;
return (ret == 0);
NonFormat:
while(*fmt) {
if (*fmt++ == '%')
goto Format;
}
return (occur == 1);
Format:
if (*fmt == '%') {
fmt++;
goto NonFormat;
}
fmt += strspn(fmt, "-+#0 '");
fmt += strspn(fmt, "0123456789");
if (*fmt == '.') {
fmt ++;
fmt += strspn(fmt, "0123456789");
}
if (*fmt == 'L')
fmt++;
if (*fmt == '\0')
return 0;
if (strchr("fFgGeEaA", *fmt)) {
occur++;
goto NonFormat;
}
return 0;
}
int
@ -72,7 +90,7 @@ main(int argc, char *argv[])
{
char c, *fmt, ftmp[4096], *sep, *starts, *steps, *ends;
bool wflag, fflag;
double start, step, end, out;
double start, step, end, out, dir;
int left, right;
sep = "\n";
@ -134,17 +152,12 @@ main(int argc, char *argv[])
start = atof(starts);
step = atof(steps);
end = atof(ends);
dir = (step > 0)? 1.0 : -1.0;
if (step == 0)
return EXIT_FAILURE;
if (start > end) {
if (step > 0)
return EXIT_FAILURE;
} else if (start < end) {
if (step < 0)
return EXIT_FAILURE;
}
if (start * dir > end * dir)
return EXIT_FAILURE;
right = MAX(digitsright(starts),
MAX(digitsright(ends),
@ -163,18 +176,8 @@ main(int argc, char *argv[])
printf(fmt, out);
out += step;
if (start > end) {
if (out >= end) {
printf("%s", sep);
} else {
break;
}
} else if (start < end) {
if (out <= end) {
printf("%s", sep);
} else {
break;
}
if (out * dir <= end * dir) {
printf("%s", sep);
} else {
break;
}