Closes: #9 ps: Remove Unix98 output limitations

ps previously followed the Unix98 standard when it comes to
user-defined output, sometimes. This meant you could have
user output format with a header that included commas and
equals signs. It was dependent on if ps thought you wanted
sysv or bsd format and THAT was dependent on things in previous
options.

It was very confusing to a user because
 ps p $$ -o pid=,comm=
gave you a two-column output but
 ps -p $$ -o pid=,comm=
would give you a one column output with the header ",comm="

The -p versus p means (to ps) you want sysv or bsd parsing.
Unix98 standard or not, this is plainly just silly.

The commit removes any of the quirks Unix98 has with user defined
output.  If you really wanted a ps header with commas in the output,
today isn't your day.

Signed-off-by: Craig Small <csmall@enc.com.au>

ps/common.h

@@ -322,7 +322,7 @@ extern char *myname;
 
 /* sortformat.c */
 extern int defer_sf_option(const char *arg, int source);
-extern const char *process_sf_options(int localbroken);
+extern const char *process_sf_options();
 extern void reset_sortformat(void);
 
 /* select.c */

ps/global.c

@@ -285,14 +285,7 @@ static const char *set_personality(void){
     return NULL;
 
   case_default: /* use defaults for ps, ignoring other environment variables */
-    return NULL;
-
   case_unknown: /* defaults, but also check inferior environment variables */
-    if(
-      getenv("UNIX95")     /* Irix */
-      || getenv("POSIXLY_CORRECT")  /* most gnu stuff */
-      || (getenv("POSIX2") && !strcmp(getenv("POSIX2"), "on")) /* Unixware 7 */
-    ) personality = PER_BROKEN_o;
     return NULL;
 
   case_aix:
@@ -334,8 +327,9 @@ static const char *set_personality(void){
   case_irix:
   case_sgi:
     s = getenv("_XPG");
-    if(s && s[0]>'0' && s[0]<='9') personality = PER_BROKEN_o;
+    if(s && s[0]>'0' && s[0]<='9')
-    else personality = PER_IRIX_l;
+        return NULL;
+    personality = PER_IRIX_l;
     return NULL;
 
   case_os390:  /* IBM's OS/390 OpenEdition on the S/390 mainframe */
@@ -346,13 +340,13 @@ static const char *set_personality(void){
 
   case_hp:
   case_hpux:
-    personality = PER_BROKEN_o | PER_HPUX_x;
+    personality = PER_HPUX_x;
     return NULL;
 
   case_svr4:
   case_sysv:
   case_sco:
-    personality = PER_BROKEN_o | PER_SVR4_x;
+    personality = PER_SVR4_x;
     return NULL;
 
   case_posix:
@@ -360,7 +354,6 @@ static const char *set_personality(void){
   case_unix95:
   case_unix98:
   case_unix:
-    personality = PER_BROKEN_o;
     return NULL;
 }
 

ps/parser.c

@@ -51,7 +51,6 @@ static int ps_argc;    /* global argc */
 static char **ps_argv; /* global argv */
 static int thisarg;    /* index into ps_argv */
 static char *flagptr;  /* current location in ps_argv[thisarg] */
-static int not_pure_unix = 0;  /* set by BSD and GNU options */
 static int force_bsd = 0;  /* set when normal parsing fails */
 
 #define exclusive(x) if((ps_argc != 2) || strcmp(ps_argv[1],x)) \
@@ -71,7 +70,6 @@ static void display_ps_version(void)
  */
 static const char *get_opt_arg(void){
   if(*(flagptr+1)){     /* argument is part of ps_argv[thisarg] */
-    not_pure_unix = 1;
     return flagptr+1;
   }
   if(thisarg+2 > ps_argc) return NULL;   /* there is nothing left */
@@ -233,18 +231,6 @@ static const char *parse_sysv_option(void){
 
   flagptr = ps_argv[thisarg];
   while(*++flagptr){
-    // Find any excuse to ignore stupid Unix98 misfeatures.
-    //
-    // This list of options is ONLY for those defined by the
-    // "IEEE Std 1003.1, 2004 Edition", "ISO/IEC 9945:2003",
-    // or "Version 2 of the Single Unix Specification".
-    //
-    // It may be time to re-think the existence of this list.
-    // In the meantime, please do not add to it. The list is
-    // intended to ONLY contain flags defined by the POSIX and UNIX
-    // standards published by The Open Group, IEEE, and ISO.
-    if(!strchr("aAdefgGlnoptuU", *flagptr)) not_pure_unix = 1;  // dude, -Z ain't in POSIX
-
     switch(*flagptr){
     case 'A':
       trace("-A selects all processes\n");
@@ -415,7 +401,7 @@ static const char *parse_sysv_option(void){
       trace("-o user-defined format\n");
       arg=get_opt_arg();
       if(!arg) return _("format specification must follow -o");
-      not_pure_unix |= defer_sf_option(arg, SF_U_o);
+      defer_sf_option(arg, SF_U_o);
       return NULL; /* can't have any more options */
     case 'p': /* end */
       trace("-p select by PID\n");
@@ -1121,7 +1107,6 @@ static const char *parse_all_options(void){
   trace("parse_all_options calling arg_type for \"%s\"\n", ps_argv[thisarg]);
     at = arg_type(ps_argv[thisarg]);
     trace("ps_argv[thisarg] is %s\n", ps_argv[thisarg]);
-    if(at != ARG_SYSV) not_pure_unix = 1;
     switch(at){
     case ARG_GNU:
       err = parse_gnu_option();
@@ -1212,7 +1197,7 @@ int arg_parse(int argc, char *argv[]){
   if(err) goto try_bsd;
   err = thread_option_check();
   if(err) goto try_bsd;
-  err = process_sf_options(!not_pure_unix);
+  err = process_sf_options();
   if(err) goto try_bsd;
   err = select_bits_setup();
   if(err) goto try_bsd;
@@ -1231,7 +1216,6 @@ try_bsd:
   ps_argv = argv;
   thisarg = 0;
   /* no need to reset flagptr */
-  not_pure_unix=1;
   force_bsd=1;
   prefer_bsd_defaults=1;
   if(!( (PER_OLD_m|PER_BSD_m) & personality )) /* if default m setting... */
@@ -1242,7 +1226,7 @@ try_bsd:
   if(err2) goto total_failure;
   err2 = thread_option_check();
   if(err2) goto total_failure;
-  err2 = process_sf_options(!not_pure_unix);
+  err2 = process_sf_options();
   if(err2) goto total_failure;
   err2 = select_bits_setup();
   if(err2) goto total_failure;

ps/sortformat.c

@@ -31,7 +31,6 @@
 #include "common.h"
 
 static sf_node *sf_list = NULL;         /* deferred sorting and formatting */
-static int broken;                      /* use gross Unix98 parsing? */
 static int have_gnu_sort = 0;           /* if true, "O" must be format */
 static int already_parsed_sort = 0;     /* redundantly set in & out of fn */
 static int already_parsed_format = 0;
@@ -205,7 +204,6 @@ double_percent:
 /***************************************************************
  * Used to parse option O lists. Option O is shared between
  * sorting and formatting. Users may expect one or the other.
- * The "broken" flag enables a really bad Unix98 misfeature.
  * Put each completed format_node onto the list starting at ->f_cooked
  */
 static const char *format_parse(sf_node *sfn){
@@ -235,9 +233,6 @@ static const char *format_parse(sf_node *sfn){
       }
       need_item=1;
       break;
-    case '=':
-      if(broken) goto out;
-      /* fall through */
     default:
       if(need_item) items++;
       need_item=0;
@@ -499,7 +494,6 @@ static const char *short_sort_parse(sf_node *sfn){
 /*
  * Used to parse option O lists. Option O is shared between
  * sorting and formatting. Users may expect one or the other.
- * The "broken" flag enables a really bad Unix98 misfeature.
  * Recursion is to preserve original order.
  */
 static const char *parse_O_option(sf_node *sfn){
@@ -750,12 +744,9 @@ static const char *generate_sysv_list(void){
  * sorting and formatting. Users may expect one or the other.
  * The "broken" flag enables a really bad Unix98 misfeature.
  */
-const char *process_sf_options(int localbroken){
+const char *process_sf_options(void){
   sf_node *sf_walk;
 
-  if(personality & PER_BROKEN_o) localbroken = 1;
-  if(personality & PER_GOOD_o)   localbroken = 0;
-  broken = localbroken;
   if(sf_list){
     const char *err;
     err = parse_O_option(sf_list);