From eb048a450cc7a0d92ac435a59d56f378b9f82667 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Thu, 7 Oct 2021 21:55:16 +0200
Subject: [PATCH] ps: fix -o pid=PID,args interpreting entire "PID,args" as
 header

procps-ng 3.3.15 does not do this.
(It could, allowing commas in headers and requiring
"ps -opid=PID -oargs" form for this case, but it does not).

function                                             old     new   delta
parse_o                                              167     190     +23

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 procps/ps.c | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/procps/ps.c b/procps/ps.c
index 711b180a0..03b9c418c 100644
--- a/procps/ps.c
+++ b/procps/ps.c
@@ -443,17 +443,19 @@ static void parse_o(char* opt)
 			opt = comma + 1;
 			continue;
 		}
-		break;
-	}
-	// opt points to last spec in comma separated list.
-	// This one can have =HEADER part.
-	new = new_out_t();
-	if (equal)
-		*equal = '\0';
-	*new = *find_out_spec(opt);
-	if (equal) {
-		*equal = '=';
-		new->header = equal + 1;
+		// opt points to last spec in comma separated list.
+		// This one can have =HEADER part.
+		new = new_out_t();
+		if (equal)
+			*equal = '\0';
+		*new = *find_out_spec(opt);
+		if (!equal)
+			break;
+		*equal++ = '=';
+		new->header = equal;
+		comma = strchr(equal, ',');
+		if (comma)
+			*comma = '\0';
 		// POSIX: the field widths shall be ... at least as wide as
 		// the header text (default or overridden value).
 		// If the header text is null, such as -o user=,
@@ -461,10 +463,12 @@ static void parse_o(char* opt)
 		// default header text
 		if (new->header[0]) {
 			new->width = strlen(new->header);
-			print_header = 1;
 		}
-	} else
-		print_header = 1;
+		if (!comma)
+			break;
+		//*comma = ','; /* no, new->header should stay NUL-terminated */
+		opt = comma + 1;
+	}
 }
 
 static void alloc_line_buffer(void)