Merge branch 'libblkid/vxfs/cleanup' of https://github.com/t-8ch/util-linux

[thirdparty/util-linux.git] / lib / cpuset.c

diff --git a/lib/cpuset.c b/lib/cpuset.c
index 78efd5302d02a28f558ca923b4985eacf79f5e87..098b8e5ae5a5c4c0d549ebbab5437df8e5a7a470 100644 (file)
--- a/lib/cpuset.c
+++ b/lib/cpuset.c
@@ -1,4 +1,6 @@
 /*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
  * Terminology:
  *
  *     cpuset  - (libc) cpu_set_t data structure represents set of CPUs
@@ -7,6 +9,9 @@
  *
  * Based on code from taskset.c and Linux kernel.
  *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
  * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
  */
 
@@ -17,7 +22,9 @@
 #include <errno.h>
 #include <string.h>
 #include <ctype.h>
+#ifdef HAVE_SYS_SYSCALL_H
 #include <sys/syscall.h>
+#endif
 
 #include "cpuset.h"
 #include "c.h"
@@ -26,23 +33,21 @@ static inline int val_to_char(int v)
 {
        if (v >= 0 && v < 10)
                return '0' + v;
-       else if (v >= 10 && v < 16)
+       if (v >= 10 && v < 16)
                return ('a' - 10) + v;
-       else
-               return -1;
+       return -1;
 }
 
 static inline int char_to_val(int c)
 {
        int cl;
 
-       cl = tolower(c);
        if (c >= '0' && c <= '9')
                return c - '0';
-       else if (cl >= 'a' && cl <= 'f')
+       cl = tolower(c);
+       if (cl >= 'a' && cl <= 'f')
                return cl + (10 - 'a');
-       else
-               return -1;
+       return -1;
 }
 
 static const char *nexttoken(const char *q,  int sep)
@@ -59,6 +64,7 @@ static const char *nexttoken(const char *q,  int sep)
  */
 int get_max_number_of_cpus(void)
 {
+#ifdef SYS_sched_getaffinity
        int n, cpus = 2048;
        size_t setsize;
        cpu_set_t *set = cpuset_alloc(cpus, &setsize, NULL);
@@ -83,6 +89,7 @@ int get_max_number_of_cpus(void)
                cpuset_free(set);
                return n * 8;
        }
+#endif
        return -1;
 }
 
@@ -164,21 +171,18 @@ char *cpulist_create(char *str, size_t len,
                                        break;
                        }
                        if (!run)
-                               rlen = snprintf(ptr, len, "%zd,", i);
+                               rlen = snprintf(ptr, len, "%zu,", i);
                        else if (run == 1) {
-                               rlen = snprintf(ptr, len, "%zd,%zd,", i, i + 1);
+                               rlen = snprintf(ptr, len, "%zu,%zu,", i, i + 1);
                                i++;
                        } else {
-                               rlen = snprintf(ptr, len, "%zd-%zd,", i, i + run);
+                               rlen = snprintf(ptr, len, "%zu-%zu,", i, i + run);
                                i += run;
                        }
-                       if (rlen < 0 || (size_t) rlen + 1 > len)
+                       if (rlen < 0 || (size_t) rlen >= len)
                                return NULL;
                        ptr += rlen;
-                       if (rlen > 0 && len > (size_t) rlen)
-                               len -= rlen;
-                       else
-                               len = 0;
+                       len -= rlen;
                }
        }
        ptr -= entry_made;
@@ -253,7 +257,6 @@ int cpumask_parse(const char *str, cpu_set_t *set, size_t setsize)
                        CPU_SET_S(cpu + 2, setsize, set);
                if (val & 8)
                        CPU_SET_S(cpu + 3, setsize, set);
-               len--;
                ptr--;
                cpu += 4;
        }
@@ -261,6 +264,19 @@ int cpumask_parse(const char *str, cpu_set_t *set, size_t setsize)
        return 0;
 }
 
+static int nextnumber(const char *str, char **end, unsigned int *result)
+{
+       errno = 0;
+       if (str == NULL || *str == '\0' || !isdigit(*str))
+               return -EINVAL;
+       *result = (unsigned int) strtoul(str, end, 10);
+       if (errno)
+               return -errno;
+       if (str == *end)
+               return -EINVAL;
+       return 0;
+}
+
 /*
  * Parses string with list of CPU ranges.
  * Returns 0 on success.
@@ -273,7 +289,7 @@ int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail)
 {
        size_t max = cpuset_nbits(setsize);
        const char *p, *q;
-       int r = 0;
+       char *end = NULL;
 
        q = str;
        CPU_ZERO_S(setsize, set);
@@ -283,21 +299,24 @@ int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail)
                unsigned int b; /* end of range */
                unsigned int s; /* stride */
                const char *c1, *c2;
-               char c;
 
-               if ((r = sscanf(p, "%u%c", &a, &c)) < 1)
+               if (nextnumber(p, &end, &a) != 0)
                        return 1;
                b = a;
                s = 1;
+               p = end;
 
                c1 = nexttoken(p, '-');
                c2 = nexttoken(p, ',');
+
                if (c1 != NULL && (c2 == NULL || c1 < c2)) {
-                       if ((r = sscanf(c1, "%u%c", &b, &c)) < 1)
+                       if (nextnumber(c1, &end, &b) != 0)
                                return 1;
-                       c1 = nexttoken(c1, ':');
+
+                       c1 = end && *end ? nexttoken(end, ':') : NULL;
+
                        if (c1 != NULL && (c2 == NULL || c1 < c2)) {
-                               if ((r = sscanf(c1, "%u%c", &s, &c)) < 1)
+                               if (nextnumber(c1, &end, &s) != 0)
                                        return 1;
                                if (s == 0)
                                        return 1;
@@ -314,12 +333,12 @@ int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail)
                }
        }
 
-       if (r == 2)
+       if (end && *end)
                return 1;
        return 0;
 }
 
-#ifdef TEST_PROGRAM
+#ifdef TEST_PROGRAM_CPUSET
 
 #include <getopt.h>
 
@@ -331,10 +350,10 @@ int main(int argc, char *argv[])
        int ncpus = 2048, rc, c;
 
        static const struct option longopts[] = {
-           { "ncpus", 1, 0, 'n' },
-           { "mask",  1, 0, 'm' },
-           { "range", 1, 0, 'r' },
-           { NULL,    0, 0, 0 }
+           { "ncpus", 1, NULL, 'n' },
+           { "mask",  1, NULL, 'm' },
+           { "range", 1, NULL, 'r' },
+           { NULL,    0, NULL, 0 }
        };
 
        while ((c = getopt_long(argc, argv, "n:m:r:", longopts, NULL)) != -1) {
@@ -383,6 +402,7 @@ int main(int argc, char *argv[])
        printf("[%s]\n", cpulist_create(buf, buflen, set, setsize));
 
        free(buf);
+       free(mask);
        free(range);
        cpuset_free(set);
 
@@ -390,7 +410,7 @@ int main(int argc, char *argv[])
 
 usage_err:
        fprintf(stderr,
-               "usage: %s [--ncpus <num>] --mask <mask> | --range <list>",
+               "usage: %s [--ncpus <num>] --mask <mask> | --range <list>\n",
                program_invocation_short_name);
        exit(EXIT_FAILURE);
 }