From 6afe7f23b0440d3261fb99e3f7b4d56bd00713cc Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Fri, 23 Mar 2001 03:44:50 +0000
Subject: [PATCH] got rid of dependency on alloca in popt

---
 popt/findme.c     | 11 +++++++----
 popt/popt.c       | 12 ++++++++++--
 popt/poptconfig.c | 15 ++++++++++-----
 popt/poptparse.c  |  7 +++++--
 4 files changed, 32 insertions(+), 13 deletions(-)

diff --git a/popt/findme.c b/popt/findme.c
index 6d1b41c1..f2ad05bb 100644
--- a/popt/findme.c
+++ b/popt/findme.c
@@ -9,7 +9,7 @@ const char * findProgramPath(const char * argv0) {
     char * path = getenv("PATH");
     char * pathbuf;
     char * start, * chptr;
-    char * buf;
+    char * buf, *local = NULL;
 
     /* If there is a / in the argv[0], it has to be an absolute
        path */
@@ -18,7 +18,7 @@ const char * findProgramPath(const char * argv0) {
 
     if (!path) return NULL;
 
-    start = pathbuf = alloca(strlen(path) + 1);
+    local = start = pathbuf = malloc(strlen(path) + 1);
     buf = malloc(strlen(path) + strlen(argv0) + 2);
     strcpy(pathbuf, path);
 
@@ -28,8 +28,10 @@ const char * findProgramPath(const char * argv0) {
 	    *chptr = '\0';
 	sprintf(buf, "%s/%s", start, argv0);
 
-	if (!access(buf, X_OK))
-	    return buf;
+	if (!access(buf, X_OK)) {
+		if (local) free(local);
+		return buf;
+	}
 
 	if (chptr) 
 	    start = chptr + 1;
@@ -38,6 +40,7 @@ const char * findProgramPath(const char * argv0) {
     } while (start && *start);
 
     free(buf);
+    if (local) free(local);
 
     return NULL;
 }
diff --git a/popt/popt.c b/popt/popt.c
index ae608f19..aef79566 100644
--- a/popt/popt.c
+++ b/popt/popt.c
@@ -227,7 +227,7 @@ static void execCommand(poptContext con) {
     if (!con->execAbsolute && strchr(script, '/')) return;
 
     if (!strchr(script, '/') && con->execPath) {
-	char *s = alloca(strlen(con->execPath) + strlen(script) + 2);
+	char *s = malloc(strlen(con->execPath) + strlen(script) + 2);
 	sprintf(s, "%s/%s", con->execPath, script);
 	argv[pos] = s;
     } else {
@@ -398,6 +398,14 @@ int poptGetNextOpt(poptContext con)
     const struct poptOption * opt = NULL;
     int done = 0;
 
+    /* looks a bit tricky to get rid of alloca properly in this fn */
+#if HAVE_ALLOCA_H
+#define ALLOCA(x) alloca(x)
+#else
+#define ALLOCA(x) malloc(x)
+#endif
+
+
     while (!done) {
 	const char * origOptString = NULL;
 	poptCallbackType cb = NULL;
@@ -436,7 +444,7 @@ int poptGetNextOpt(poptContext con)
 
 	    /* Make a copy we can hack at */
 	    localOptString = optString =
-			strcpy(alloca(strlen(origOptString) + 1),
+			strcpy(ALLOCA(strlen(origOptString) + 1),
 			origOptString);
 
 	    if (!optString[0])
diff --git a/popt/poptconfig.c b/popt/poptconfig.c
index 7a1a4c2b..eb769413 100644
--- a/popt/poptconfig.c
+++ b/popt/poptconfig.c
@@ -55,8 +55,8 @@ static void configLine(poptContext con, char * line) {
 }
 
 int poptReadConfigFile(poptContext con, const char * fn) {
-    char * file, * chptr, * end;
-    char * buf, * dst;
+    char * file=NULL, * chptr, * end;
+    char * buf=NULL, * dst;
     int fd, rc;
     int fileLength;
 
@@ -71,16 +71,17 @@ int poptReadConfigFile(poptContext con, const char * fn) {
     fileLength = lseek(fd, 0, SEEK_END);
     (void) lseek(fd, 0, 0);
 
-    file = alloca(fileLength + 1);
+    file = malloc(fileLength + 1);
     if (read(fd, file, fileLength) != fileLength) {
 	rc = errno;
 	close(fd);
 	errno = rc;
+	if (file) free(file);
 	return POPT_ERROR_ERRNO;
     }
     close(fd);
 
-    dst = buf = alloca(fileLength + 1);
+    dst = buf = malloc(fileLength + 1);
 
     chptr = file;
     end = (file + fileLength);
@@ -111,6 +112,9 @@ int poptReadConfigFile(poptContext con, const char * fn) {
 	}
     }
 
+    free(file);
+    free(buf);
+
     return 0;
 }
 
@@ -125,10 +129,11 @@ int poptReadDefaultConfig(poptContext con, /*@unused@*/ int useEnv) {
     if (getuid() != geteuid()) return 0;
 
     if ((home = getenv("HOME"))) {
-	fn = alloca(strlen(home) + 20);
+	fn = malloc(strlen(home) + 20);
 	strcpy(fn, home);
 	strcat(fn, "/.popt");
 	rc = poptReadConfigFile(con, fn);
+	free(fn);
 	if (rc) return rc;
     }
 
diff --git a/popt/poptparse.c b/popt/poptparse.c
index 7c9f06be..8f00769b 100644
--- a/popt/poptparse.c
+++ b/popt/poptparse.c
@@ -43,7 +43,8 @@ int poptParseArgvString(const char * s, int * argcPtr, const char *** argvPtr)
     const char ** argv = malloc(sizeof(*argv) * argvAlloced);
     int argc = 0;
     int buflen = strlen(s) + 1;
-    char * buf = memset(alloca(buflen), 0, buflen);
+    char *buf0 = calloc(buflen, 1);
+    char *buf = buf0;
 
     argv[argc] = buf;
 
@@ -55,6 +56,7 @@ int poptParseArgvString(const char * s, int * argcPtr, const char *** argvPtr)
 		src++;
 		if (!*src) {
 		    free(argv);
+		    free(buf0);
 		    return POPT_ERROR_BADQUOTE;
 		}
 		if (*src != quote) *buf++ = '\\';
@@ -78,6 +80,7 @@ int poptParseArgvString(const char * s, int * argcPtr, const char *** argvPtr)
 	    src++;
 	    if (!*src) {
 		free(argv);
+		free(buf0);
 		return POPT_ERROR_BADQUOTE;
 	    }
 	    /*@fallthrough@*/
@@ -94,6 +97,6 @@ int poptParseArgvString(const char * s, int * argcPtr, const char *** argvPtr)
     (void) poptDupArgv(argc, argv, argcPtr, argvPtr);
 
     free(argv);
-
+    free(buf0);
     return 0;
 }
-- 
2.34.1