Renamed loader2 subdirectory to loader (hooray for git)

1 files changed, 247 insertions, 0 deletions

diff --git a/loader/loadermisc.c b/loader/loadermisc.c
new file mode 100644
index 000000000..1fd77093f
--- /dev/null
+++ b/loader/loadermisc.c
@@ -0,0 +1,247 @@
+/*
+ * loadermisc.c - miscellaneous loader functions that don't seem to fit
+ * anywhere else (yet)  (was misc.c)
+ * JKFIXME: need to break out into reasonable files based on function
+ *
+ * Copyright (C) 1999, 2000, 2001, 2002  Red Hat, Inc.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author(s): Erik Troan <ewt@redhat.com>
+ *            Matt Wilson <msw@redhat.com>
+ *            Michael Fulbright <msf@redhat.com>
+ *            Jeremy Katz <katzj@redhat.com>
+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+#include "log.h"
+
+int copyFileFd(int infd, char * dest) {
+    int outfd;
+    char buf[4096];
+    int i;
+    int rc = 0;
+
+    outfd = open(dest, O_CREAT | O_RDWR, 0666);
+
+    if (outfd < 0) {
+        logMessage(ERROR, "failed to open %s: %m", dest);
+        return 1;
+    }
+
+    while ((i = read(infd, buf, sizeof(buf))) > 0) {
+        if (write(outfd, buf, i) != i) {
+            rc = 1;
+            break;
+        }
+    }
+
+    close(outfd);
+
+    return rc;
+}
+
+int copyFile(char * source, char * dest) {
+    int infd = -1;
+    int rc;
+
+    infd = open(source, O_RDONLY);
+
+    if (infd < 0) {
+        logMessage(ERROR, "failed to open %s: %m", source);
+        return 1;
+    }
+
+    rc = copyFileFd(infd, dest);
+
+    close(infd);
+
+    return rc;
+}
+
+char * readLine(FILE * f) {
+    char buf[1024], *ret;
+
+    ret = fgets(buf, sizeof(buf), f);
+
+    /* chop */
+    buf[strlen(buf) - 1] = '\0';
+
+    return strdup(buf);
+}
+
+/* FIXME: when we only depend on glibc, we could use strvercmp instead */
+/* compare alpha and numeric segments of two versions */
+/* return 1: a is newer than b */
+/*        0: a and b are the same version */
+/*       -1: b is newer than a */
+static int rpmvercmp(const char * a, const char * b)
+{
+    char oldch1, oldch2;
+    char * str1, * str2;
+    char * one, * two;
+    int rc;
+    int isnum;
+
+    /* easy comparison to see if versions are identical */
+    if (!strcmp(a, b)) return 0;
+
+    str1 = alloca(strlen(a) + 1);
+    str2 = alloca(strlen(b) + 1);
+
+    strcpy(str1, a);
+    strcpy(str2, b);
+
+    one = str1;
+    two = str2;
+
+    /* loop through each version segment of str1 and str2 and compare them */
+    while (*one && *two) {
+	while (*one && !isalnum(*one)) one++;
+	while (*two && !isalnum(*two)) two++;
+
+	str1 = one;
+	str2 = two;
+
+	/* grab first completely alpha or completely numeric segment */
+	/* leave one and two pointing to the start of the alpha or numeric */
+	/* segment and walk str1 and str2 to end of segment */
+	if (isdigit(*str1)) {
+	    while (*str1 && isdigit(*str1)) str1++;
+	    while (*str2 && isdigit(*str2)) str2++;
+	    isnum = 1;
+	} else {
+	    while (*str1 && isalpha(*str1)) str1++;
+	    while (*str2 && isalpha(*str2)) str2++;
+	    isnum = 0;
+	}
+
+	/* save character at the end of the alpha or numeric segment */
+	/* so that they can be restored after the comparison */
+	oldch1 = *str1;
+	*str1 = '\0';
+	oldch2 = *str2;
+	*str2 = '\0';
+
+	/* take care of the case where the two version segments are */
+	/* different types: one numeric, the other alpha (i.e. empty) */
+	if (one == str1) return -1;	/* arbitrary */
+	/* XXX See patch #60884 (and details) from bugzilla #50977. */
+	if (two == str2) return (isnum ? 1 : -1);
+
+	if (isnum) {
+	    /* this used to be done by converting the digit segments */
+	    /* to ints using atoi() - it's changed because long  */
+	    /* digit segments can overflow an int - this should fix that. */
+
+	    /* throw away any leading zeros - it's a number, right? */
+	    while (*one == '0') one++;
+	    while (*two == '0') two++;
+
+	    /* whichever number has more digits wins */
+	    if (strlen(one) > strlen(two)) return 1;
+	    if (strlen(two) > strlen(one)) return -1;
+	}
+
+	/* strcmp will return which one is greater - even if the two */
+	/* segments are alpha or if they are numeric.  don't return  */
+	/* if they are equal because there might be more segments to */
+	/* compare */
+	rc = strcmp(one, two);
+	if (rc) return (rc < 1 ? -1 : 1);
+
+	/* restore character that was replaced by null above */
+	*str1 = oldch1;
+	one = str1;
+	*str2 = oldch2;
+	two = str2;
+    }
+
+    /* this catches the case where all numeric and alpha segments have */
+    /* compared identically but the segment sepparating characters were */
+    /* different */
+    if ((!*one) && (!*two)) return 0;
+
+    /* whichever version still has characters left over wins */
+    if (!*one) return -1; else return 1;
+}
+
+int simpleStringCmp(const void * a, const void * b) {
+    const char * first = *((const char **) a);
+    const char * second = *((const char **) b);
+
+    return rpmvercmp(first, second);
+}
+
+/* look for available memory.  note: won't ever report more than the 
+ * 900 megs or so supported by the -BOOT kernel due to not using e820 */
+int totalMemory(void) {
+    int fd;
+    int bytesRead;
+    char buf[4096];
+    char * chptr, * start;
+    int total = 0;
+    
+    fd = open("/proc/meminfo", O_RDONLY);
+    if (fd < 0) {
+        logMessage(ERROR, "failed to open /proc/meminfo: %m");
+        return 0;
+    }
+    
+    bytesRead = read(fd, buf, sizeof(buf) - 1);
+    if (bytesRead < 0) {
+        logMessage(ERROR, "failed to read from /proc/meminfo: %m");
+        close(fd);
+        return 0;
+    }
+    
+    close(fd);
+    buf[bytesRead] = '\0';
+    
+    chptr = buf;
+    while (*chptr && !total) {
+        if (strncmp(chptr, "MemTotal:", 9)) {
+            chptr++;
+            continue;
+        }
+
+        start = ++chptr ;
+        while (*chptr && *chptr != '\n') chptr++;
+
+        *chptr = '\0';
+    
+        while (!isdigit(*start) && *start) start++;
+        if (!*start) {
+            logMessage(WARNING, "no number appears after MemTotal tag");
+            return 0;
+        }
+
+        chptr = start;
+        while (*chptr && isdigit(*chptr)) {
+            total = (total * 10) + (*chptr - '0');
+            chptr++;
+        }
+    }
+
+    logMessage(INFO, "%d kB are available", total);
+    
+    return total;
+}