Various pages: EXAMPLES: Use unsigned types for loop iterators

Looping with unsigned types is safer.  See the link below.

When the iterators are used for accessing an array, use size_t;
otherwise, use the most appropriate unsigned type, which in most
cases is just 'unsigned int'.

Also adjust other variables that have to interact with the
iterators, to avoid comparison of integers of different
signedness.

Link: <https://gustedt.wordpress.com/2013/07/15/a-praise-of-size_t-and-other-unsigned-types/>
Cc: Jens Gustedt <jens.gustedt@inria.fr>
Signed-off-by: Alex Colomar <alx.manpages@gmail.com>

46 files changed, 111 insertions, 109 deletions

diff --git a/man1/sprof.1 b/man1/sprof.1
index 35bd42c3d..0acb51b46 100644
--- a/man1/sprof.1
+++ b/man1/sprof.1
@@ -96,27 +96,27 @@ $ \fBcat libdemo.c\fP
 void
 consumeCpu1(int lim)
 {
-    for (int j = 0; j < lim; j++)
+    for (unsigned int j = 0; j < lim; j++)
 	getppid();
 }
 
 void
 x1(void) {
-    for (int j = 0; j < 100; j++)
+    for (unsigned int j = 0; j < 100; j++)
 	consumeCpu1(200000);
 }
 
 void
 consumeCpu2(int lim)
 {
-    for (int j = 0; j < lim; j++)
+    for (unsigned int j = 0; j < lim; j++)
 	getppid();
 }
 
 void
 x2(void)
 {
-    for (int j = 0; j < 1000; j++)
+    for (unsigned int j = 0; j < 1000; j++)
 	consumeCpu2(10000);
 }
 .EE
diff --git a/man2/close_range.2 b/man2/close_range.2
index 386f829c9..054c91c70 100644
--- a/man2/close_range.2
+++ b/man2/close_range.2
@@ -247,7 +247,7 @@ main(int argc, char *argv[])
 {
     int  fd;
 
-    for (int j = 1; j < argc; j++) {
+    for (size_t j = 1; j < argc; j++) {
         fd = open(argv[j], O_RDONLY);
         if (fd == \-1) {
             perror(argv[j]);
diff --git a/man2/eventfd.2 b/man2/eventfd.2
index 71517ad3a..8315f852c 100644
--- a/man2/eventfd.2
+++ b/man2/eventfd.2
@@ -405,7 +405,7 @@ main(int argc, char *argv[])
 
     switch (fork()) {
     case 0:
-        for (int j = 1; j < argc; j++) {
+        for (size_t j = 1; j < argc; j++) {
             printf("Child writing %s to efd\en", argv[j]);
             u = strtoull(argv[j], NULL, 0);
                     /* strtoull() allows various bases */
diff --git a/man2/execve.2 b/man2/execve.2
index 744d06c27..4855d7c1e 100644
--- a/man2/execve.2
+++ b/man2/execve.2
@@ -790,8 +790,8 @@ It just echoes its command-line arguments, one per line.
 int
 main(int argc, char *argv[])
 {
-    for (int j = 0; j < argc; j++)
-        printf("argv[%d]: %s\en", j, argv[j]);
+    for (size_t j = 0; j < argc; j++)
+        printf("argv[%zu]: %s\en", j, argv[j]);
 
     exit(EXIT_SUCCESS);
 }
diff --git a/man2/futex.2 b/man2/futex.2
index 1332ae852..53caab621 100644
--- a/man2/futex.2
+++ b/man2/futex.2
@@ -1882,8 +1882,8 @@ fpost(uint32_t *futexp)
 int
 main(int argc, char *argv[])
 {
-    pid_t childPid;
-    int nloops;
+    pid_t         childPid;
+    unsigned int  nloops;
 
     setbuf(stdout, NULL);
 
@@ -1913,9 +1913,9 @@ main(int argc, char *argv[])
         err(EXIT_FAILURE, "fork");
 
     if (childPid == 0) {        /* Child */
-        for (int j = 0; j < nloops; j++) {
+        for (unsigned int j = 0; j < nloops; j++) {
             fwait(futex1);
-            printf("Child  (%jd) %d\en", (intmax_t) getpid(), j);
+            printf("Child  (%jd) %u\en", (intmax_t) getpid(), j);
             fpost(futex2);
         }
 
@@ -1924,9 +1924,9 @@ main(int argc, char *argv[])
 
     /* Parent falls through to here. */
 
-    for (int j = 0; j < nloops; j++) {
+    for (unsigned int j = 0; j < nloops; j++) {
         fwait(futex2);
-        printf("Parent (%jd) %d\en", (intmax_t) getpid(), j);
+        printf("Parent (%jd) %u\en", (intmax_t) getpid(), j);
         fpost(futex1);
     }
 
diff --git a/man2/open_by_handle_at.2 b/man2/open_by_handle_at.2
index de9c3b745..48d07fde7 100644
--- a/man2/open_by_handle_at.2
+++ b/man2/open_by_handle_at.2
@@ -586,7 +586,7 @@ main(int argc, char *argv[])
 
     printf("%d\en", mount_id);
     printf("%u %d   ", fhp\->handle_bytes, fhp\->handle_type);
-    for (int j = 0; j < fhp\->handle_bytes; j++)
+    for (size_t j = 0; j < fhp\->handle_bytes; j++)
         printf(" %02x", fhp\->f_handle[j]);
     printf("\en");
 
@@ -699,7 +699,7 @@ main(int argc, char *argv[])
 
     fhp\->handle_type = strtoul(nextp, &nextp, 0);
 
-    for (int j = 0; j < fhp\->handle_bytes; j++)
+    for (size_t j = 0; j < fhp\->handle_bytes; j++)
         fhp\->f_handle[j] = strtoul(nextp, &nextp, 16);
 
     /* Obtain file descriptor for mount point, either by opening
diff --git a/man2/poll.2 b/man2/poll.2
index e8be13543..8d2b08d63 100644
--- a/man2/poll.2
+++ b/man2/poll.2
@@ -561,8 +561,9 @@ at which point the file descriptor was closed and the program terminated.
 int
 main(int argc, char *argv[])
 {
-    int            nfds, num_open_fds, ready;
+    int            ready;
     char           buf[10];
+    nfds_t         num_open_fds, nfds;
     ssize_t        s;
     struct pollfd  *pfds;
 
@@ -578,7 +579,7 @@ main(int argc, char *argv[])
 
     /* Open each file on command line, and add it \(aqpfds\(aq array. */
 
-    for (int j = 0; j < nfds; j++) {
+    for (nfds_t j = 0; j < nfds; j++) {
         pfds[j].fd = open(argv[j + 1], O_RDONLY);
         if (pfds[j].fd == \-1)
             errExit("open");
@@ -601,7 +602,7 @@ main(int argc, char *argv[])
 
         /* Deal with array returned by poll(). */
 
-        for (int j = 0; j < nfds; j++) {
+        for (nfds_t j = 0; j < nfds; j++) {
             if (pfds[j].revents != 0) {
                 printf("  fd=%d; events: %s%s%s\en", pfds[j].fd,
                        (pfds[j].revents & POLLIN)  ? "POLLIN "  : "",
diff --git a/man2/recvmmsg.2 b/man2/recvmmsg.2
index 4a76273a1..0e4117297 100644
--- a/man2/recvmmsg.2
+++ b/man2/recvmmsg.2
@@ -245,7 +245,7 @@ main(void)
     }
 
     memset(msgs, 0, sizeof(msgs));
-    for (int i = 0; i < VLEN; i++) {
+    for (size_t i = 0; i < VLEN; i++) {
         iovecs[i].iov_base         = bufs[i];
         iovecs[i].iov_len          = BUFSIZE;
         msgs[i].msg_hdr.msg_iov    = &iovecs[i];
@@ -262,9 +262,9 @@ main(void)
     }
 
     printf("%d messages received\en", retval);
-    for (int i = 0; i < retval; i++) {
+    for (size_t i = 0; i < retval; i++) {
         bufs[i][msgs[i].msg_len] = 0;
-        printf("%d %s", i+1, bufs[i]);
+        printf("%zu %s", i+1, bufs[i]);
     }
     exit(EXIT_SUCCESS);
 }
diff --git a/man2/sched_setaffinity.2 b/man2/sched_setaffinity.2
index 553ccf36d..b4963e853 100644
--- a/man2/sched_setaffinity.2
+++ b/man2/sched_setaffinity.2
@@ -356,7 +356,7 @@ main(int argc, char *argv[])
 {
     cpu_set_t set;
     int parentCPU, childCPU;
-    int nloops;
+    unsigned int nloops;
 
     if (argc != 4) {
         fprintf(stderr, "Usage: %s parent\-cpu child\-cpu num\-loops\en",
@@ -380,7 +380,7 @@ main(int argc, char *argv[])
         if (sched_setaffinity(getpid(), sizeof(set), &set) == \-1)
             err(EXIT_FAILURE, "sched_setaffinity");
 
-        for (int j = 0; j < nloops; j++)
+        for (unsigned int j = 0; j < nloops; j++)
             getppid();
 
         exit(EXIT_SUCCESS);
@@ -391,7 +391,7 @@ main(int argc, char *argv[])
         if (sched_setaffinity(getpid(), sizeof(set), &set) == \-1)
             err(EXIT_FAILURE, "sched_setaffinity");
 
-        for (int j = 0; j < nloops; j++)
+        for (unsigned int j = 0; j < nloops; j++)
             getppid();
 
         wait(NULL);     /* Wait for child to terminate */
diff --git a/man2/timerfd_create.2 b/man2/timerfd_create.2
index 9850f14c9..c53c97e24 100644
--- a/man2/timerfd_create.2
+++ b/man2/timerfd_create.2
@@ -633,9 +633,9 @@ int
 main(int argc, char *argv[])
 {
     struct itimerspec new_value;
-    int max_exp, fd;
+    int fd;
     struct timespec now;
-    uint64_t exp, tot_exp;
+    uint64_t exp, tot_exp, max_exp;
     ssize_t s;
 
     if (argc != 2 && argc != 4) {
diff --git a/man2/userfaultfd.2 b/man2/userfaultfd.2
index c91a83132..b2ee1ed3b 100644
--- a/man2/userfaultfd.2
+++ b/man2/userfaultfd.2
@@ -859,11 +859,10 @@ fault_handler_thread(void *arg)
 int
 main(int argc, char *argv[])
 {
-    int l;
     char c;
     long uffd;          /* userfaultfd file descriptor */
     char *addr;         /* Start of region handled by userfaultfd */
-    uint64_t len;       /* Length of region handled by userfaultfd */
+    size_t len, l;      /* Length of region handled by userfaultfd */
     pthread_t thr;      /* ID of thread that handles page faults */
     struct uffdio_api uffdio_api;
     struct uffdio_register uffdio_register;
diff --git a/man3/CPU_SET.3 b/man3/CPU_SET.3
index 968da2b39..c043ecc6d 100644
--- a/man3/CPU_SET.3
+++ b/man3/CPU_SET.3
@@ -313,8 +313,7 @@ int
 main(int argc, char *argv[])
 {
     cpu_set_t *cpusetp;
-    size_t size;
-    int num_cpus;
+    size_t size, num_cpus;
 
     if (argc < 2) {
         fprintf(stderr, "Usage: %s <num\-cpus>\en", argv[0]);
@@ -332,7 +331,7 @@ main(int argc, char *argv[])
     size = CPU_ALLOC_SIZE(num_cpus);
 
     CPU_ZERO_S(size, cpusetp);
-    for (int cpu = 0; cpu < num_cpus; cpu += 2)
+    for (size_t cpu = 0; cpu < num_cpus; cpu += 2)
         CPU_SET_S(cpu, size, cpusetp);
 
     printf("CPU_COUNT() of set:    %d\en", CPU_COUNT_S(size, cpusetp));
diff --git a/man3/backtrace.3 b/man3/backtrace.3
index 8b91cb125..9d62a7f78 100644
--- a/man3/backtrace.3
+++ b/man3/backtrace.3
@@ -245,7 +245,7 @@ myfunc3(void)
         exit(EXIT_FAILURE);
     }
 
-    for (int j = 0; j < nptrs; j++)
+    for (size_t j = 0; j < nptrs; j++)
         printf("%s\en", strings[j]);
 
     free(strings);
diff --git a/man3/bsearch.3 b/man3/bsearch.3
index d6f5ff1d8..b46b7e433 100644
--- a/man3/bsearch.3
+++ b/man3/bsearch.3
@@ -114,7 +114,7 @@ int
 main(int argc, char *argv[])
 {
     qsort(months, ARRAY_SIZE(months), sizeof(months[0]), compmi);
-    for (int i = 1; i < argc; i++) {
+    for (size_t i = 1; i < argc; i++) {
         struct mi key;
         struct mi *res;
 
diff --git a/man3/dl_iterate_phdr.3 b/man3/dl_iterate_phdr.3
index 717f25027..f0a552abc 100644
--- a/man3/dl_iterate_phdr.3
+++ b/man3/dl_iterate_phdr.3
@@ -301,7 +301,7 @@ callback(struct dl_phdr_info *info, size_t size, void *data)
     printf("Name: \e"%s\e" (%d segments)\en", info\->dlpi_name,
                info\->dlpi_phnum);
 
-    for (int j = 0; j < info\->dlpi_phnum; j++) {
+    for (size_t j = 0; j < info\->dlpi_phnum; j++) {
         p_type = info\->dlpi_phdr[j].p_type;
         type =  (p_type == PT_LOAD) ? "PT_LOAD" :
                 (p_type == PT_DYNAMIC) ? "PT_DYNAMIC" :
@@ -314,7 +314,7 @@ callback(struct dl_phdr_info *info, size_t size, void *data)
                 (p_type == PT_GNU_STACK) ? "PT_GNU_STACK" :
                 (p_type == PT_GNU_RELRO) ? "PT_GNU_RELRO" : NULL;
 
-        printf("    %2d: [%14p; memsz:%7jx] flags: %#jx; ", j,
+        printf("    %2zu: [%14p; memsz:%7jx] flags: %#jx; ", j,
                 (void *) (info\->dlpi_addr + info\->dlpi_phdr[j].p_vaddr),
                 (uintmax_t) info\->dlpi_phdr[j].p_memsz,
                 (uintmax_t) info\->dlpi_phdr[j].p_flags);
diff --git a/man3/dlinfo.3 b/man3/dlinfo.3
index 05cba8046..cac9b4824 100644
--- a/man3/dlinfo.3
+++ b/man3/dlinfo.3
@@ -304,8 +304,8 @@ main(int argc, char *argv[])
         exit(EXIT_FAILURE);
     }
 
-    for (int j = 0; j < serinfo.dls_cnt; j++)
-        printf("dls_serpath[%d].dls_name = %s\en",
+    for (size_t j = 0; j < serinfo.dls_cnt; j++)
+        printf("dls_serpath[%zu].dls_name = %s\en",
                j, sip\->dls_serpath[j].dls_name);
 
     exit(EXIT_SUCCESS);
diff --git a/man3/encrypt.3 b/man3/encrypt.3
index 671be82a2..6970e2f70 100644
--- a/man3/encrypt.3
+++ b/man3/encrypt.3
@@ -169,12 +169,12 @@ main(void)
     char buf[64];
     char txt[9];
 
-    for (int i = 0; i < 64; i++) {
+    for (size_t i = 0; i < 64; i++) {
         key[i] = rand() & 1;
     }
 
-    for (int i = 0; i < 8; i++) {
-        for (int j = 0; j < 8; j++) {
+    for (size_t i = 0; i < 8; i++) {
+        for (size_t j = 0; j < 8; j++) {
             buf[i * 8 + j] = orig[i] >> j & 1;
         }
         setkey(key);
@@ -182,8 +182,8 @@ main(void)
     printf("Before encrypting: %s\en", orig);
 
     encrypt(buf, 0);
-    for (int i = 0; i < 8; i++) {
-        for (int j = 0, txt[i] = \(aq\e0\(aq; j < 8; j++) {
+    for (size_t i = 0; i < 8; i++) {
+        for (size_t j = 0, txt[i] = \(aq\e0\(aq; j < 8; j++) {
             txt[i] |= buf[i * 8 + j] << j;
         }
         txt[8] = \(aq\e0\(aq;
@@ -191,8 +191,8 @@ main(void)
     printf("After encrypting:  %s\en", txt);
 
     encrypt(buf, 1);
-    for (int i = 0; i < 8; i++) {
-        for (int j = 0, txt[i] = \(aq\e0\(aq; j < 8; j++) {
+    for (size_t i = 0; i < 8; i++) {
+        for (size_t j = 0, txt[i] = \(aq\e0\(aq; j < 8; j++) {
             txt[i] |= buf[i * 8 + j] << j;
         }
         txt[8] = \(aq\e0\(aq;
diff --git a/man3/envz_add.3 b/man3/envz_add.3
index c983c0702..08782cf0f 100644
--- a/man3/envz_add.3
+++ b/man3/envz_add.3
@@ -155,7 +155,7 @@ main(int argc, char *argv[], char *envp[])
     char    *str;
     size_t  e_len = 0;
 
-    for (int i = 0; envp[i] != NULL; i++)
+    for (size_t i = 0; envp[i] != NULL; i++)
         e_len += strlen(envp[i]) + 1;
 
     str = envz_entry(*envp, e_len, "HOME");
diff --git a/man3/fopencookie.3 b/man3/fopencookie.3
index 86b25cb83..0d05fa13a 100644
--- a/man3/fopencookie.3
+++ b/man3/fopencookie.3
@@ -418,7 +418,7 @@ main(int argc, char *argv[])
 
     /* Write command\-line arguments to our file. */
 
-    for (int j = 1; j < argc; j++)
+    for (size_t j = 1; j < argc; j++)
         if (fputs(argv[j], stream) == EOF) {
             perror("fputs");
             exit(EXIT_FAILURE);
diff --git a/man3/getaddrinfo.3 b/man3/getaddrinfo.3
index d4d7afa79..51adb3be9 100644
--- a/man3/getaddrinfo.3
+++ b/man3/getaddrinfo.3
@@ -808,13 +808,13 @@ main(int argc, char *argv[])
     /* Send remaining command\-line arguments as separate
        datagrams, and read responses from server. */
 
-    for (int j = 3; j < argc; j++) {
+    for (size_t j = 3; j < argc; j++) {
         len = strlen(argv[j]) + 1;
                 /* +1 for terminating null byte */
 
         if (len > BUF_SIZE) {
             fprintf(stderr,
-                    "Ignoring long message in argument %d\en", j);
+                    "Ignoring long message in argument %zu\en", j);
             continue;
         }
 
diff --git a/man3/getaddrinfo_a.3 b/man3/getaddrinfo_a.3
index a45179d16..b6d9bd3ed 100644
--- a/man3/getaddrinfo_a.3
+++ b/man3/getaddrinfo_a.3
@@ -353,7 +353,7 @@ main(int argc, char *argv[])
         exit(EXIT_FAILURE);
     }
 
-    for (int i = 0; i < argc \- 1; i++) {
+    for (size_t i = 0; i < argc \- 1; i++) {
         reqs[i] = malloc(sizeof(*reqs[0]));
         if (reqs[i] == NULL) {
             perror("malloc");
@@ -370,7 +370,7 @@ main(int argc, char *argv[])
         exit(EXIT_FAILURE);
     }
 
-    for (int i = 0; i < argc \- 1; i++) {
+    for (size_t i = 0; i < argc \- 1; i++) {
         printf("%s: ", reqs[i]\->ar_name);
         ret = gai_error(reqs[i]);
         if (ret == 0) {
@@ -432,7 +432,7 @@ The program source is as follows:
 #include <string.h>
 
 static struct gaicb **reqs = NULL;
-static int nreqs = 0;
+static size_t nreqs = 0;
 
 static char *
 getcmd(void)
@@ -453,7 +453,7 @@ getcmd(void)
 static void
 add_requests(void)
 {
-    int nreqs_base = nreqs;
+    size_t nreqs_base = nreqs;
     char *host;
     int ret;
 
@@ -481,7 +481,8 @@ static void
 wait_requests(void)
 {
     char *id;
-    int ret, n;
+    int ret;
+    size_t n;
     struct gaicb const **wait_reqs = calloc(nreqs, sizeof(*wait_reqs));
                 /* NULL elements are ignored by gai_suspend(). */
 
@@ -502,7 +503,7 @@ wait_requests(void)
         return;
     }
 
-    for (int i = 0; i < nreqs; i++) {
+    for (size_t i = 0; i < nreqs; i++) {
         if (wait_reqs[i] == NULL)
             continue;
 
@@ -510,7 +511,7 @@ wait_requests(void)
         if (ret == EAI_INPROGRESS)
             continue;
 
-        printf("[%02d] %s: %s\en", i, reqs[i]\->ar_name,
+        printf("[%02zu] %s: %s\en", i, reqs[i]\->ar_name,
                ret == 0 ? "Finished" : gai_strerror(ret));
     }
 }
@@ -520,7 +521,8 @@ static void
 cancel_requests(void)
 {
     char *id;
-    int ret, n;
+    int ret;
+    size_t n;
 
     while ((id = strtok(NULL, " ")) != NULL) {
         n = atoi(id);
@@ -544,8 +546,8 @@ list_requests(void)
     char host[NI_MAXHOST];
     struct addrinfo *res;
 
-    for (int i = 0; i < nreqs; i++) {
-        printf("[%02d] %s: ", i, reqs[i]\->ar_name);
+    for (size_t i = 0; i < nreqs; i++) {
+        printf("[%02zu] %s: ", i, reqs[i]\->ar_name);
         ret = gai_error(reqs[i]);
 
         if (!ret) {
diff --git a/man3/getdate.3 b/man3/getdate.3
index cc65ea3a2..871475ef7 100644
--- a/man3/getdate.3
+++ b/man3/getdate.3
@@ -281,7 +281,7 @@ main(int argc, char *argv[])
 {
     struct tm *tmp;
 
-    for (int j = 1; j < argc; j++) {
+    for (size_t j = 1; j < argc; j++) {
         tmp = getdate(argv[j]);
 
         if (tmp == NULL) {
@@ -290,7 +290,7 @@ main(int argc, char *argv[])
             continue;
         }
 
-        printf("Call %d (\e"%s\e") succeeded:\en", j, argv[j]);
+        printf("Call %zu (\e"%s\e") succeeded:\en", j, argv[j]);
         printf("    tm_sec   = %d\en", tmp\->tm_sec);
         printf("    tm_min   = %d\en", tmp\->tm_min);
         printf("    tm_hour  = %d\en", tmp\->tm_hour);
diff --git a/man3/getgrent_r.3 b/man3/getgrent_r.3
index 0f734d595..46112794f 100644
--- a/man3/getgrent_r.3
+++ b/man3/getgrent_r.3
@@ -190,7 +190,7 @@ main(void)
         if (i)
             break;
         printf("%s (%jd):", grpp\->gr_name, (intmax_t) grpp\->gr_gid);
-        for (int j = 0; ; j++) {
+        for (size_t j = 0; ; j++) {
             if (grpp\->gr_mem[j] == NULL)
                 break;
             printf(" %s", grpp\->gr_mem[j]);
diff --git a/man3/getgrouplist.3 b/man3/getgrouplist.3
index efba0eab4..4f0d686cc 100644
--- a/man3/getgrouplist.3
+++ b/man3/getgrouplist.3
@@ -181,7 +181,7 @@ main(int argc, char *argv[])
     /* Display list of retrieved groups, along with group names. */
 
     fprintf(stderr, "ngroups = %d\en", ngroups);
-    for (int j = 0; j < ngroups; j++) {
+    for (size_t j = 0; j < ngroups; j++) {
         printf("%d", groups[j]);
         gr = getgrgid(groups[j]);
         if (gr != NULL)
diff --git a/man3/hsearch.3 b/man3/hsearch.3
index 1b35a61c1..e3856aca6 100644
--- a/man3/hsearch.3
+++ b/man3/hsearch.3
@@ -306,7 +306,7 @@ main(void)
 
     hcreate(30);
 
-    for (int i = 0; i < 24; i++) {
+    for (size_t i = 0; i < 24; i++) {
         e.key = data[i];
         /* data is just an integer, instead of a
            pointer to something */
@@ -319,7 +319,7 @@ main(void)
         }
     }
 
-    for (int i = 22; i < 26; i++) {
+    for (size_t i = 22; i < 26; i++) {
         /* print two entries from the table, and
            show that two are not in the table */
         e.key = data[i];
diff --git a/man3/mallinfo.3 b/man3/mallinfo.3
index a1d13a38f..66cee7c7a 100644
--- a/man3/mallinfo.3
+++ b/man3/mallinfo.3
@@ -285,8 +285,7 @@ main(int argc, char *argv[])
 {
 #define MAX_ALLOCS 2000000
     char *alloc[MAX_ALLOCS];
-    int numBlocks, freeBegin, freeEnd, freeStep;
-    size_t blockSize;
+    size_t blockSize, numBlocks, freeBegin, freeEnd, freeStep;
 
     if (argc < 3 || strcmp(argv[1], "\-\-help") == 0) {
         fprintf(stderr, "%s num\-blocks block\-size [free\-step "
@@ -303,7 +302,7 @@ main(int argc, char *argv[])
     printf("============== Before allocating blocks ==============\en");
     display_mallinfo2();
 
-    for (int j = 0; j < numBlocks; j++) {
+    for (size_t j = 0; j < numBlocks; j++) {
         if (numBlocks >= MAX_ALLOCS) {
             fprintf(stderr, "Too many allocations\en");
             exit(EXIT_FAILURE);
@@ -319,7 +318,7 @@ main(int argc, char *argv[])
     printf("\en============== After allocating blocks ==============\en");
     display_mallinfo2();
 
-    for (int j = freeBegin; j < freeEnd; j += freeStep)
+    for (size_t j = freeBegin; j < freeEnd; j += freeStep)
         free(alloc[j]);
 
     printf("\en============== After freeing blocks ==============\en");
diff --git a/man3/malloc_info.3 b/man3/malloc_info.3
index dbeb0ee92..f21263075 100644
--- a/man3/malloc_info.3
+++ b/man3/malloc_info.3
@@ -174,8 +174,9 @@ glibc 2.13
 #include <stdlib.h>
 #include <unistd.h>
 
-static size_t blockSize;
-static int numThreads, numBlocks;
+static size_t        blockSize;
+static size_t        numThreads;
+static unsigned int  numBlocks;
 
 static void *
 thread_func(void *arg)
@@ -185,7 +186,7 @@ thread_func(void *arg)
     /* The multiplier \(aq(2 + tn)\(aq ensures that each thread (including
        the main thread) allocates a different amount of memory. */
 
-    for (int j = 0; j < numBlocks; j++)
+    for (unsigned int j = 0; j < numBlocks; j++)
         if (malloc(blockSize * (2 + tn)) == NULL)
             err(EXIT_FAILURE, "malloc\-thread");
 
@@ -220,7 +221,7 @@ main(int argc, char *argv[])
 
     /* Create threads that allocate different amounts of memory. */
 
-    for (int tn = 0; tn < numThreads; tn++) {
+    for (size_t tn = 0; tn < numThreads; tn++) {
         errno = pthread_create(&thr[tn], NULL, thread_func,
                                (void *) tn);
         if (errno != 0)
@@ -237,7 +238,7 @@ main(int argc, char *argv[])
 
     /* The main thread also allocates some memory. */
 
-    for (int j = 0; j < numBlocks; j++)
+    for (unsigned int j = 0; j < numBlocks; j++)
         if (malloc(blockSize) == NULL)
             err(EXIT_FAILURE, "malloc");
 
diff --git a/man3/mtrace.3 b/man3/mtrace.3
index a7cb6176b..d03e92534 100644
--- a/man3/mtrace.3
+++ b/man3/mtrace.3
@@ -137,7 +137,7 @@ main(void)
 {
     mtrace();
 
-    for (int j = 0; j < 2; j++)
+    for (unsigned int j = 0; j < 2; j++)
         malloc(100);            /* Never freed\-\-a memory leak */
 
     calloc(16, 16);             /* Never freed\-\-a memory leak */
diff --git a/man3/pthread_create.3 b/man3/pthread_create.3
index 7c95b3ab7..46b1b23b5 100644
--- a/man3/pthread_create.3
+++ b/man3/pthread_create.3
@@ -311,8 +311,9 @@ thread_start(void *arg)
 int
 main(int argc, char *argv[])
 {
-    int                 s, opt, num_threads;
+    int                 s, opt;
     void                *res;
+    size_t              num_threads;
     ssize_t             stack_size;
     pthread_attr_t      attr;
     struct thread_info  *tinfo;
@@ -355,7 +356,7 @@ main(int argc, char *argv[])
 
     /* Create one thread for each command\-line argument. */
 
-    for (int tnum = 0; tnum < num_threads; tnum++) {
+    for (size_t tnum = 0; tnum < num_threads; tnum++) {
         tinfo[tnum].thread_num = tnum + 1;
         tinfo[tnum].argv_string = argv[optind + tnum];
 
@@ -377,7 +378,7 @@ main(int argc, char *argv[])
 
     /* Now join with each thread, and display its returned value. */
 
-    for (int tnum = 0; tnum < num_threads; tnum++) {
+    for (size_t tnum = 0; tnum < num_threads; tnum++) {
         s = pthread_join(tinfo[tnum].thread_id, &res);
         if (s != 0)
             handle_error_en(s, "pthread_join");
diff --git a/man3/pthread_getcpuclockid.3 b/man3/pthread_getcpuclockid.3
index 669ce2255..1c2549e48 100644
--- a/man3/pthread_getcpuclockid.3
+++ b/man3/pthread_getcpuclockid.3
@@ -149,7 +149,7 @@ main(void)
     sleep(1);
 
     printf("Main thread consuming some CPU time...\en");
-    for (int j = 0; j < 2000000; j++)
+    for (unsigned int j = 0; j < 2000000; j++)
         getppid();
 
     pclock("Process total CPU time: ", CLOCK_PROCESS_CPUTIME_ID);
diff --git a/man3/pthread_setaffinity_np.3 b/man3/pthread_setaffinity_np.3
index c86db65ba..8a4fdc6bf 100644
--- a/man3/pthread_setaffinity_np.3
+++ b/man3/pthread_setaffinity_np.3
@@ -176,7 +176,7 @@ main(void)
     /* Set affinity mask to include CPUs 0 to 7. */
 
     CPU_ZERO(&cpuset);
-    for (int j = 0; j < 8; j++)
+    for (size_t j = 0; j < 8; j++)
         CPU_SET(j, &cpuset);
 
     s = pthread_setaffinity_np(thread, sizeof(cpuset), &cpuset);
@@ -190,9 +190,9 @@ main(void)
         errc(EXIT_FAILURE, s, "pthread_getaffinity_np");
 
     printf("Set returned by pthread_getaffinity_np() contained:\en");
-    for (int j = 0; j < CPU_SETSIZE; j++)
+    for (size_t j = 0; j < CPU_SETSIZE; j++)
         if (CPU_ISSET(j, &cpuset))
-            printf("    CPU %d\en", j);
+            printf("    CPU %zu\en", j);
 
     exit(EXIT_SUCCESS);
 }
diff --git a/man3/qsort.3 b/man3/qsort.3
index 1007653df..fb9c2381d 100644
--- a/man3/qsort.3
+++ b/man3/qsort.3
@@ -137,7 +137,7 @@ main(int argc, char *argv[])
 
     qsort(&argv[1], argc \- 1, sizeof(char *), cmpstringp);
 
-    for (int j = 1; j < argc; j++)
+    for (size_t j = 1; j < argc; j++)
         puts(argv[j]);
     exit(EXIT_SUCCESS);
 }
diff --git a/man3/rand.3 b/man3/rand.3
index c235170ae..25e715dd3 100644
--- a/man3/rand.3
+++ b/man3/rand.3
@@ -199,8 +199,8 @@ when given a particular seed.
 int
 main(int argc, char *argv[])
 {
-    int r, nloops;
-    unsigned int seed;
+    int           r;
+    unsigned int  seed, nloops;
 
     if (argc != 3) {
         fprintf(stderr, "Usage: %s <seed> <nloops>\en", argv[0]);
@@ -211,7 +211,7 @@ main(int argc, char *argv[])
     nloops = atoi(argv[2]);
 
     srand(seed);
-    for (int j = 0; j < nloops; j++) {
+    for (unsigned int j = 0; j < nloops; j++) {
         r =  rand();
         printf("%d\en", r);
     }
diff --git a/man3/regex.3 b/man3/regex.3
index e423e442d..c86628e9a 100644
--- a/man3/regex.3
+++ b/man3/regex.3
@@ -351,13 +351,13 @@ int main(void)
     printf("String = \e"%s\e"\en", str);
     printf("Matches:\en");
 
-    for (int i = 0; ; i++) {
+    for (unsigned int i = 0; ; i++) {
         if (regexec(&regex, s, ARRAY_SIZE(pmatch), pmatch, 0))
             break;
 
         off = pmatch[0].rm_so + (s \- str);
         len = pmatch[0].rm_eo \- pmatch[0].rm_so;
-        printf("#%d:\en", i);
+        printf("#%zu:\en", i);
         printf("offset = %jd; length = %jd\en", (intmax_t) off,
                 (intmax_t) len);
         printf("substring = \e"%.*s\e"\en", len, s + pmatch[0].rm_so);
diff --git a/man3/shm_open.3 b/man3/shm_open.3
index ea429ddd4..672fa5a88 100644
--- a/man3/shm_open.3
+++ b/man3/shm_open.3
@@ -388,7 +388,7 @@ main(int argc, char *argv[])
 
     /* Convert data in shared memory into upper case. */
 
-    for (int j = 0; j < shmp\->cnt; j++)
+    for (size_t j = 0; j < shmp\->cnt; j++)
         shmp\->buf[j] = toupper((unsigned char) shmp\->buf[j]);
 
     /* Post \(aqsem2\(aq to tell the peer that it can now
diff --git a/man3/slist.3 b/man3/slist.3
index 6e32dba90..bd0a09602 100644
--- a/man3/slist.3
+++ b/man3/slist.3
@@ -293,7 +293,7 @@ main(void)
     SLIST_REMOVE_HEAD(&head, entries);      /* Deletion from the head */
     free(n3);
 
-    for (int i = 0; i < 5; i++) {
+    for (unsigned int i = 0; i < 5; i++) {
         n1 = malloc(sizeof(struct entry));
         SLIST_INSERT_HEAD(&head, n1, entries);
         n1\->data = i;
diff --git a/man3/stailq.3 b/man3/stailq.3
index 359c1342c..6a3d361ba 100644
--- a/man3/stailq.3
+++ b/man3/stailq.3
@@ -351,7 +351,7 @@ main(void)
 
     n1 = STAILQ_FIRST(&head);
     n1\->data = 0;
-    for (int i = 1; i < 5; i++) {
+    for (unsigned int i = 1; i < 5; i++) {
         n1 = malloc(sizeof(struct entry));
         STAILQ_INSERT_HEAD(&head, n1, entries);
         n1\->data = i;
diff --git a/man3/strcat.3 b/man3/strcat.3
index b44208a45..632cc2cc8 100644
--- a/man3/strcat.3
+++ b/man3/strcat.3
@@ -208,9 +208,9 @@ main(void)
     base = time(NULL);
     p[0] = \(aq\e0\(aq;
 
-    for (int j = 0; j < LIM; j++) {
+    for (unsigned int j = 0; j < LIM; j++) {
         if ((j % 10000) == 0)
-            printf("%d %jd\en", j, (intmax_t) (time(NULL) \- base));
+            printf("%u %jd\en", j, (intmax_t) (time(NULL) \- base));
         strcat(p, "a");
     }
 }
diff --git a/man3/strsep.3 b/man3/strsep.3
index 7a7a7f598..adf3c7a6b 100644
--- a/man3/strsep.3
+++ b/man3/strsep.3
@@ -141,8 +141,8 @@ main(int argc, char *argv[])
         exit(EXIT_FAILURE);
     }
 
-    for (int j = 1; (token = strsep(&argv[1], argv[2])); j++) {
-        printf("%d: %s\en", j, token);
+    for (unsigned int j = 1; (token = strsep(&argv[1], argv[2])); j++) {
+        printf("%u: %s\en", j, token);
 
         while ((subtoken = strsep(&token, argv[3])))
             printf("\et \-\-> %s\en", subtoken);
diff --git a/man3/tsearch.3 b/man3/tsearch.3
index 05380ed4b..b2515e147 100644
--- a/man3/tsearch.3
+++ b/man3/tsearch.3
@@ -311,7 +311,7 @@ main(void)
     int **val;
 
     srand(time(NULL));
-    for (int i = 0; i < 12; i++) {
+    for (unsigned int i = 0; i < 12; i++) {
         int *ptr = xmalloc(sizeof(*ptr));
         *ptr = rand() & 0xff;
         val = tsearch(ptr, &root, compare);
diff --git a/man3/wordexp.3 b/man3/wordexp.3
index ea3c631ec..262126ec6 100644
--- a/man3/wordexp.3
+++ b/man3/wordexp.3
@@ -232,7 +232,7 @@ main(int argc, char *argv[])
 
     wordexp("[a\-c]*.c", &p, 0);
     w = p.we_wordv;
-    for (int i = 0; i < p.we_wordc; i++)
+    for (size_t i = 0; i < p.we_wordc; i++)
         printf("%s\en", w[i]);
     wordfree(&p);
     exit(EXIT_SUCCESS);
diff --git a/man5/core.5 b/man5/core.5
index 04e34bbf9..4df94d3c1 100644
--- a/man5/core.5
+++ b/man5/core.5
@@ -652,8 +652,8 @@ main(int argc, char *argv[])
        pipe program. */
 
     fprintf(fp, "argc=%d\en", argc);
-    for (int j = 0; j < argc; j++)
-        fprintf(fp, "argc[%d]=<%s>\en", j, argv[j]);
+    for (size_t j = 0; j < argc; j++)
+        fprintf(fp, "argc[%zu]=<%s>\en", j, argv[j]);
 
     /* Count bytes in standard input (the core dump). */
 
diff --git a/man7/aio.7 b/man7/aio.7
index 73ffbc5dd..130b83d68 100644
--- a/man7/aio.7
+++ b/man7/aio.7
@@ -312,7 +312,7 @@ main(int argc, char *argv[])
     /* Open each file specified on the command line, and queue
        a read request on the resulting file descriptor. */
 
-    for (int j = 0; j < numReqs; j++) {
+    for (size_t j = 0; j < numReqs; j++) {
         ioList[j].reqNum = j;
         ioList[j].status = EINPROGRESS;
         ioList[j].aiocbp = &aiocbList[j];
@@ -355,9 +355,9 @@ main(int argc, char *argv[])
 
             printf("got SIGQUIT; canceling I/O requests: \en");
 
-            for (int j = 0; j < numReqs; j++) {
+            for (size_t j = 0; j < numReqs; j++) {
                 if (ioList[j].status == EINPROGRESS) {
-                    printf("    Request %d on descriptor %d:", j,
+                    printf("    Request %zu on descriptor %d:", j,
                             ioList[j].aiocbp\->aio_fildes);
                     s = aio_cancel(ioList[j].aiocbp\->aio_fildes,
                             ioList[j].aiocbp);
@@ -379,9 +379,9 @@ main(int argc, char *argv[])
            in progress. */
 
         printf("aio_error():\en");
-        for (int j = 0; j < numReqs; j++) {
+        for (size_t j = 0; j < numReqs; j++) {
             if (ioList[j].status == EINPROGRESS) {
-                printf("    for request %d (descriptor %d): ",
+                printf("    for request %zu (descriptor %d): ",
                         j, ioList[j].aiocbp\->aio_fildes);
                 ioList[j].status = aio_error(ioList[j].aiocbp);
 
@@ -411,11 +411,11 @@ main(int argc, char *argv[])
     /* Check status return of all I/O requests. */
 
     printf("aio_return():\en");
-    for (int j = 0; j < numReqs; j++) {
+    for (size_t j = 0; j < numReqs; j++) {
         ssize_t s;
 
         s = aio_return(ioList[j].aiocbp);
-        printf("    for request %d (descriptor %d): %zd\en",
+        printf("    for request %zu (descriptor %d): %zd\en",
                 j, ioList[j].aiocbp\->aio_fildes, s);
     }
 
diff --git a/man7/inotify.7 b/man7/inotify.7
index dd6bc37d4..77c79ab62 100644
--- a/man7/inotify.7
+++ b/man7/inotify.7
@@ -965,7 +965,7 @@ handle_events(int fd, int *wd, int argc, char* argv[])
 
             /* Print the name of the watched directory. */
 
-            for (int i = 1; i < argc; ++i) {
+            for (size_t i = 1; i < argc; ++i) {
                 if (wd[i] == event\->wd) {
                     printf("%s/", argv[i]);
                     break;
diff --git a/man7/unix.7 b/man7/unix.7
index 37f22320f..f44ffbe30 100644
--- a/man7/unix.7
+++ b/man7/unix.7
@@ -1154,7 +1154,7 @@ main(int argc, char *argv[])
 
     /* Send arguments. */
 
-    for (int i = 1; i < argc; ++i) {
+    for (size_t i = 1; i < argc; ++i) {
         ret = write(data_socket, argv[i], strlen(argv[i]) + 1);
         if (ret == \-1) {
             perror("write");
diff --git a/man7/user_namespaces.7 b/man7/user_namespaces.7
index 74a066966..7ed3b026f 100644
--- a/man7/user_namespaces.7
+++ b/man7/user_namespaces.7
@@ -1220,7 +1220,7 @@ update_map(char *mapping, char *map_file)
     /* Replace commas in mapping string with newlines. */
 
     map_len = strlen(mapping);
-    for (int j = 0; j < map_len; j++)
+    for (size_t j = 0; j < map_len; j++)
         if (mapping[j] == \(aq,\(aq)
             mapping[j] = \(aq\en\(aq;