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-rw-r--r--util.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..0e5825a
--- /dev/null
+++ b/util.c
@@ -0,0 +1,60 @@
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "util.h"
+
+#define SYSFS_CPU "/sys/devices/system/cpu/cpu"
+#define MAXCPUS 1024
+
+unsigned get_ncpus(void)
+{
+ char path[cstrlen(SYSFS_CPU "1024") + 1];
+ unsigned n;
+
+ for (n = 0; n < MAXCPUS; n++) {
+ snprintf(path, sizeof(path), "%s%u", SYSFS_CPU, n);
+ if (access(path, F_OK) == -1)
+ break;
+ }
+
+ return n == 0 ? 1 : n;
+}
+
+
+static void query(const char *prompt, const char *def, char *buf, int len)
+{
+ buf[0] = '\0';
+
+ printf("%s [%s]: ", prompt, def);
+ fflush(stdout);
+
+ fgets(buf, len, stdin);
+ if (buf[0] == '\0' || buf[0] == '\n') {
+ snprintf(buf, len, "%s", def);
+ } else if(strchr(buf, '\n')) {
+ *strchr(buf, '\n') = '\0';
+ }
+}
+
+
+void ask_string(char *buf, int len, const char *prompt, const char *def)
+{
+ query(prompt, def, buf, len);
+}
+
+
+void ask_num(int *res, int max, const char *prompt, int def)
+{
+ char buf[21], buf2[256];
+ int num;
+
+ snprintf(buf, sizeof(buf), "%i", def);
+ do {
+ query(prompt, buf, buf2, sizeof(buf2));
+ num = atoi(buf2); /* TODO: errors (strtol)*/
+ } while (num > max);
+
+ *res = num;
+}
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