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-rw-r--r--xargs.c76
1 files changed, 59 insertions, 17 deletions
diff --git a/xargs.c b/xargs.c
index 478e0ee6d..21bfb6bbe 100644
--- a/xargs.c
+++ b/xargs.c
@@ -29,6 +29,59 @@
#include <getopt.h>
#include <ctype.h>
+/* get_sh_safe_line_from_file() - This function reads an entire line from a text file
+ * up to a newline. It returns a malloc'ed char * which must be stored and
+ * free'ed by the caller. */
+extern char *get_sh_safe_line_from_file(FILE *file)
+{
+ static const int GROWBY = 80; /* how large we will grow strings by */
+
+ char ch, last_ch = 0;
+ char tmp[]=" ";
+ int idx = 0;
+ char *linebuf = NULL;
+ int linebufsz = 0;
+
+ while (1) {
+ ch = fgetc(file);
+ if (ch == EOF)
+ break;
+
+ /* grow the line buffer as necessary */
+ while (idx > linebufsz-4)
+ linebuf = xrealloc(linebuf, linebufsz += GROWBY);
+
+ /* Remove any extra spaces */
+ if (last_ch == ' ' && ch == ' ')
+ continue;
+
+ /* Replace any tabs with spaces */
+ if (ch == '\t')
+ ch=' ';
+
+ /* Escape any characters that are treated specially by /bin/sh */
+ *tmp=ch;
+ if (strpbrk(tmp, "\\~`!$^&*()=|{}[];\"'<>?#") != NULL && last_ch!='\\') {
+ linebuf[idx++] = '\\';
+ }
+
+ linebuf[idx++] = ch;
+ last_ch=ch;
+
+ if (ch == '\n')
+ break;
+ }
+ if (idx == 0 && last_ch!=0)
+ linebuf[idx++]=' ';
+
+ if (idx == 0)
+ return NULL;
+
+ linebuf[idx] = 0;
+ return linebuf;
+}
+
+
int xargs_main(int argc, char **argv)
{
@@ -54,7 +107,7 @@ int xargs_main(int argc, char **argv)
}
/* Store the command and arguments to be executed (from the command line) */
- if (argc == 1) {
+ if (argc == 0) {
len_args_from_cmdline = 6;
args_from_cmdline = xmalloc(len_args_from_cmdline);
strcat(args_from_cmdline, "echo ");
@@ -72,6 +125,7 @@ int xargs_main(int argc, char **argv)
}
strcat(args_from_cmdline, *argv);
strcat(args_from_cmdline, " ");
+ ++argv;
}
}
@@ -79,30 +133,19 @@ int xargs_main(int argc, char **argv)
len_cmd_to_be_executed=10;
cmd_to_be_executed = xcalloc(len_cmd_to_be_executed, sizeof(char));
strcpy(cmd_to_be_executed, args_from_cmdline);
- strcat(cmd_to_be_executed, " \"");
/* Now, read in one line at a time from stdin, and run command+args on it */
- in_from_stdin = get_line_from_file(stdin);
+ in_from_stdin = get_sh_safe_line_from_file(stdin);
for (;in_from_stdin!=NULL;) {
char *tmp;
opt = strlen(in_from_stdin);
len = opt + len_args_from_cmdline;
len_cmd_to_be_executed+=len+3;
cmd_to_be_executed=xrealloc(cmd_to_be_executed, len_cmd_to_be_executed);
-
+
/* Strip out the final \n */
in_from_stdin[opt-1]=' ';
-
- /* Replace any tabs with spaces */
- while( (tmp = strchr(in_from_stdin, '\t')) != NULL )
- *tmp=' ';
-
- /* Strip out any extra intra-word spaces */
- while( (tmp = strstr(in_from_stdin, " ")) != NULL ) {
- opt = strlen(in_from_stdin);
- memmove(tmp, tmp+1, opt-(tmp-in_from_stdin));
- }
-
+
/* trim trailing whitespace */
opt = strlen(in_from_stdin) - 1;
while (isspace(in_from_stdin[opt]))
@@ -118,10 +161,9 @@ int xargs_main(int argc, char **argv)
strcat(cmd_to_be_executed, " ");
free(in_from_stdin);
- in_from_stdin = get_line_from_file(stdin);
+ in_from_stdin = get_sh_safe_line_from_file(stdin);
}
- strcat(cmd_to_be_executed, "\"");
if (traceflag==1)
fputs(cmd_to_be_executed, stderr);