tc: B.W limits can now be specified in %.

[mirror_iproute2.git] / lib / utils.c

diff --git a/lib/utils.c b/lib/utils.c
index 48cead19d62b8375a7184e39e81d4335f7b5407e..7ced8c061cb092474b2ba46b8298cb44c883c985 100644 (file)
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -38,6 +38,74 @@
 int resolve_hosts;
 int timestamp_short;
 
+int read_prop(const char *dev, char *prop, long *value)
+{
+       char fname[128], buf[80], *endp, *nl;
+       FILE *fp;
+       long result;
+       int ret;
+
+       ret = snprintf(fname, sizeof(fname), "/sys/class/net/%s/%s",
+                       dev, prop);
+
+       if (ret <= 0 || ret >= sizeof(fname)) {
+               fprintf(stderr, "could not build pathname for property\n");
+               return -1;
+       }
+
+       fp = fopen(fname, "r");
+       if (fp == NULL) {
+               fprintf(stderr, "fopen %s: %s\n", fname, strerror(errno));
+               return -1;
+       }
+
+       if (!fgets(buf, sizeof(buf), fp)) {
+               fprintf(stderr, "property \"%s\" in file %s is currently unknown\n", prop, fname);
+               fclose(fp);
+               goto out;
+       }
+
+       nl = strchr(buf, '\n');
+       if (nl)
+               *nl = '\0';
+
+       fclose(fp);
+       result = strtol(buf, &endp, 0);
+
+       if (*endp || buf == endp) {
+               fprintf(stderr, "value \"%s\" in file %s is not a number\n",
+                       buf, fname);
+               goto out;
+       }
+
+       if ((result == LONG_MAX || result == LONG_MIN) && errno == ERANGE) {
+               fprintf(stderr, "strtol %s: %s", fname, strerror(errno));
+               goto out;
+       }
+
+       *value = result;
+       return 0;
+out:
+       fprintf(stderr, "Failed to parse %s\n", fname);
+       return -1;
+}
+
+/* Parse a percent e.g: '30%'
+ * return: 0 = ok, -1 = error, 1 = out of range
+ */
+int parse_percent(double *val, const char *str)
+{
+       char *p;
+
+       *val = strtod(str, &p) / 100.;
+       if (*val == HUGE_VALF || *val == HUGE_VALL)
+               return 1;
+       if (*val == 0.0 || (*p && strcmp(p, "%")))
+               return -1;
+
+       return 0;
+}
+
 int get_hex(char c)
 {
        if (c >= 'A' && c <= 'F')