journalctl: rework short output mode to rebuild full syslog message

[elogind.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index 195835425d2fef51e4ec08f8121f432853eb6d5d..2b735e8413bfeb7649c731a866de7c8bbfb8147c 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -517,7 +517,7 @@ int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
                 return -errno;
 
         if (!(fgets(line, sizeof(line), f))) {
-                r = -errno;
+                r = feof(f) ? -EIO : -errno;
                 fclose(f);
                 return r;
         }
@@ -562,7 +562,7 @@ int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
                 return -errno;
 
         if (!(fgets(line, sizeof(line), f))) {
-                r = -errno;
+                r = feof(f) ? -EIO : -errno;
                 fclose(f);
                 return r;
         }
@@ -709,7 +709,7 @@ int read_one_line_file(const char *fn, char **line) {
                 return -errno;
 
         if (!(fgets(t, sizeof(t), f))) {
-                r = -errno;
+                r = feof(f) ? -EIO : -errno;
                 goto finish;
         }
 
@@ -2885,7 +2885,8 @@ ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
         while (nbytes > 0) {
                 ssize_t k;
 
-                if ((k = write(fd, p, nbytes)) <= 0) {
+                k = write(fd, p, nbytes);
+                if (k <= 0) {
 
                         if (k < 0 && errno == EINTR)
                                 continue;
@@ -3295,7 +3296,7 @@ int get_ctty_devnr(pid_t pid, dev_t *d) {
                 return -errno;
 
         if (!fgets(line, sizeof(line), f)) {
-                k = -errno;
+                k = feof(f) ? -EIO : -errno;
                 fclose(f);
                 return k;
         }
@@ -3576,9 +3577,12 @@ cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
         }
 }
 
-void status_vprintf(const char *format, va_list ap) {
-        char *s = NULL;
-        int fd = -1;
+void status_vprintf(const char *status, bool ellipse, const char *format, va_list ap) {
+        char *s = NULL, *spaces = NULL, *e;
+        int fd = -1, c;
+        size_t emax, sl, left;
+        struct iovec iovec[5];
+        int n = 0;
 
         assert(format);
 
@@ -3588,25 +3592,69 @@ void status_vprintf(const char *format, va_list ap) {
         if (vasprintf(&s, format, ap) < 0)
                 goto finish;
 
-        if ((fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0)
+        fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
+        if (fd < 0)
                 goto finish;
 
-        write(fd, s, strlen(s));
+        if (ellipse) {
+                c = fd_columns(fd);
+                if (c <= 0)
+                        c = 80;
+
+                if (status) {
+                        sl = 2 + 6 + 1; /* " [" status "]" */
+                        emax = (size_t) c > sl ? c - sl - 1 : 0;
+                } else
+                        emax = c - 1;
+
+                e = ellipsize(s, emax, 75);
+                if (e) {
+                        free(s);
+                        s = e;
+                }
+        }
+
+        zero(iovec);
+        IOVEC_SET_STRING(iovec[n++], s);
+
+        if (ellipse) {
+                sl = strlen(s);
+                left = emax > sl ? emax - sl : 0;
+                if (left > 0) {
+                        spaces = malloc(left);
+                        if (spaces) {
+                                memset(spaces, ' ', left);
+                                iovec[n].iov_base = spaces;
+                                iovec[n].iov_len = left;
+                                n++;
+                        }
+                }
+        }
+
+        if (status) {
+                IOVEC_SET_STRING(iovec[n++], " [");
+                IOVEC_SET_STRING(iovec[n++], status);
+                IOVEC_SET_STRING(iovec[n++], "]\n");
+        } else
+                IOVEC_SET_STRING(iovec[n++], "\n");
+
+        writev(fd, iovec, n);
 
 finish:
         free(s);
+        free(spaces);
 
         if (fd >= 0)
                 close_nointr_nofail(fd);
 }
 
-void status_printf(const char *format, ...) {
+void status_printf(const char *status, bool ellipse, const char *format, ...) {
         va_list ap;
 
         assert(format);
 
         va_start(ap, format);
-        status_vprintf(format, ap);
+        status_vprintf(status, ellipse, format, ap);
         va_end(ap);
 }
 
@@ -3763,7 +3811,9 @@ void status_welcome(void) {
         if (!ansi_color && !const_color)
                 const_color = "1";
 
-        status_printf("\nWelcome to \x1B[%sm%s\x1B[0m!\n\n",
+        status_printf(NULL,
+                      false,
+                      "\nWelcome to \x1B[%sm%s\x1B[0m!\n",
                       const_color ? const_color : ansi_color,
                       const_pretty ? const_pretty : pretty_name);
 
@@ -3905,6 +3955,19 @@ char **replace_env_argv(char **argv, char **env) {
         return r;
 }
 
+int fd_columns(int fd) {
+        struct winsize ws;
+        zero(ws);
+
+        if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
+                return -errno;
+
+        if (ws.ws_col <= 0)
+                return -EIO;
+
+        return ws.ws_col;
+}
+
 unsigned columns(void) {
         static __thread int parsed_columns = 0;
         const char *e;
@@ -3912,16 +3975,12 @@ unsigned columns(void) {
         if (_likely_(parsed_columns > 0))
                 return parsed_columns;
 
-        if ((e = getenv("COLUMNS")))
+        e = getenv("COLUMNS");
+        if (e)
                 parsed_columns = atoi(e);
 
-        if (parsed_columns <= 0) {
-                struct winsize ws;
-                zero(ws);
-
-                if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) >= 0)
-                        parsed_columns = ws.ws_col;
-        }
+        if (parsed_columns <= 0)
+                parsed_columns = fd_columns(STDOUT_FILENO);
 
         if (parsed_columns <= 0)
                 parsed_columns = 80;
@@ -4693,6 +4752,24 @@ int pipe_eof(int fd) {
         return pollfd.revents & POLLHUP;
 }
 
+int fd_wait_for_event(int fd, int event) {
+        struct pollfd pollfd;
+        int r;
+
+        zero(pollfd);
+        pollfd.fd = fd;
+        pollfd.events = event;
+
+        r = poll(&pollfd, 1, -1);
+        if (r < 0)
+                return -errno;
+
+        if (r == 0)
+                return 0;
+
+        return pollfd.revents;
+}
+
 int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
         FILE *f;
         char *t;
@@ -5939,3 +6016,50 @@ unsigned long cap_last_cap(void) {
 
         return p;
 }
+
+char *format_bytes(char *buf, size_t l, off_t t) {
+        unsigned i;
+
+        static const struct {
+                const char *suffix;
+                off_t factor;
+        } table[] = {
+                { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
+                { "G", 1024ULL*1024ULL*1024ULL },
+                { "M", 1024ULL*1024ULL },
+                { "K", 1024ULL },
+        };
+
+        for (i = 0; i < ELEMENTSOF(table); i++) {
+
+                if (t >= table[i].factor) {
+                        snprintf(buf, l,
+                                 "%llu.%llu%s",
+                                 (unsigned long long) (t / table[i].factor),
+                                 (unsigned long long) (((t*10ULL) / table[i].factor) % 10ULL),
+                                 table[i].suffix);
+
+                        goto finish;
+                }
+        }
+
+        snprintf(buf, l, "%lluB", (unsigned long long) t);
+
+finish:
+        buf[l-1] = 0;
+        return buf;
+
+}
+
+void* memdup(const void *p, size_t l) {
+        void *r;
+
+        assert(p);
+
+        r = malloc(l);
+        if (!r)
+                return NULL;
+
+        memcpy(r, p, l);
+        return r;
+}