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/*
* Top users/processes display for Unix
* Version 3
*
* This program may be freely redistributed,
* but this entire comment MUST remain intact.
*/
/*
* This file handles color definitions and access for augmenting
* the output with ansi color sequences.
*
* The definition of a color setting is as follows, separated by
* colons:
*
* tag=minimum,maximum#code
*
* "tag" is the name of the value to display with color.
*
* "minimum" and "maximum" are positive integer values defining a range:
* when the value is within this range it will be shown with the
* specified color. A missing value indicates that no check should be
* made (i.e.: ",25" is n <= 25; "25,50" is 25 <= n <= 50; and "50,"
* is 50 <= n).
*
* "code" is the ansi sequence that defines the color to use with the
* escape sequence "[m". Semi-colons are allowed in this string to
* combine attributes.
*/
#include "os.h"
#include "message.h"
#include "display.h"
typedef struct color_entry
{
char *tag;
int min;
int max;
char color;
struct color_entry *next;
struct color_entry *tagnext;
} color_entry;
static color_entry *entries = NULL;
static color_entry **bytag = NULL;
static char **bytag_names = NULL;
static int totaltags = 0;
static int tagcnt = 0;
static char **color_ansi = NULL;
static int num_color_ansi = 0;
static int max_color_ansi = 0;
#define COLOR_ANSI_SLOTS 20
static int
color_slot(char *str)
{
int i;
for (i = 0; i < num_color_ansi; i++)
{
if (strcmp(color_ansi[i], str) == 0)
{
return i;
}
}
/* need a new slot */
if (num_color_ansi >= max_color_ansi)
{
max_color_ansi += COLOR_ANSI_SLOTS;
color_ansi = (char **) realloc(color_ansi, max_color_ansi * sizeof(char *));
}
color_ansi[num_color_ansi] = strdup(str);
return num_color_ansi++;
}
/*
* int color_env_parse(char *env)
*
* Parse a color specification "env" (such as one found in the environment) and
* add them to the list of entries. Always returns 0. Should only be called
* once.
*/
int
color_env_parse(char *env)
{
char *p;
char *min;
char *max;
char *str;
int len;
color_entry *ce;
/* initialization */
color_ansi = (char **) malloc(COLOR_ANSI_SLOTS * sizeof(char *));
max_color_ansi = COLOR_ANSI_SLOTS;
/* color slot 0 is always "0" */
color_slot("0");
if (env != NULL)
{
p = strtok(env, ":");
while (p != NULL)
{
if ((min = strchr(p, '=')) != NULL &&
(max = strchr(min, ',')) != NULL &&
(str = strchr(max, '#')) != NULL)
{
ce = (color_entry *) malloc(sizeof(color_entry));
len = min - p;
ce->tag = (char *) malloc(len + 1);
strncpy(ce->tag, p, len);
ce->tag[len] = '\0';
ce->min = atoi(++min);
ce->max = atoi(++max);
ce->color = color_slot(++str);
ce->next = entries;
entries = ce;
}
else
{
if (min != NULL)
{
len = min - p;
}
else
{
len = strlen(p);
}
display_error_message(" %.*s: bad color entry", len, p);
}
p = strtok(NULL, ":");
}
}
return 0;
}
/*
* int color_tag(char *tag)
*
* Declare "tag" as a color tag. Return a tag index to use when testing
* a valuse against the tests for this tag. Should not be called before
* color_env_parse.
*/
int
color_tag(char *tag)
{
color_entry *entryp;
color_entry *tp;
if (tag == NULL || *tag == '\0')
{
return -1;
}
if (bytag == NULL)
{
totaltags = 10;
bytag = (color_entry **) malloc(totaltags * sizeof(color_entry *));
bytag_names = (char **) malloc(totaltags * sizeof(char *));
}
if (tagcnt >= totaltags)
{
totaltags *= 2;
bytag = (color_entry **) realloc(bytag, totaltags * sizeof(color_entry *));
bytag_names = (char **) realloc(bytag_names, totaltags * sizeof(char *));
}
entryp = entries;
tp = NULL;
while (entryp != NULL)
{
if (strcmp(entryp->tag, tag) == 0)
{
entryp->tagnext = tp;
tp = entryp;
}
entryp = entryp->next;
}
bytag[tagcnt] = tp;
bytag_names[tagcnt] = strdup(tag);
return (tagcnt++);
}
/*
* int color_test(int tagidx, int value)
*
* Test "value" against tests for tag "tagidx", a number previously returned
* by color_tag. Return the correct color number to use when highlighting.
* If there is no match, return 0 (color 0).
*/
int
color_test(int tagidx, int value)
{
color_entry *ce;
/* sanity check */
if (tagidx < 0 || tagidx >= tagcnt)
{
return 0;
}
ce = bytag[tagidx];
while (ce != NULL)
{
if ((!ce->min || ce->min <= value) &&
(!ce->max || ce->max >= value))
{
return ce->color;
}
ce = ce->tagnext;
}
return 0;
}
/*
* char *color_set(int color)
*
* Return ANSI string to set the terminal for color number "color".
*/
char *
color_set(int color)
{
static char v[32];
v[0] = '\0';
if (color >=0 && color <num_color_ansi)
{
snprintf(v, sizeof(v), "\033[%sm", color_ansi[color]);
}
return v;
}
void
color_dump(FILE *f)
{
color_entry *ep;
int i;
int col;
int len;
fputs("These color tags are available:", f);
col = 81;
for (i = 0; i < tagcnt; i++)
{
len = strlen(bytag_names[i]) + 1;
if (len + col > 79)
{
fputs("\n ", f);
col = 2;
}
fprintf(f, " %s", bytag_names[i]);
col += len;
}
fputs("\n\nTop color settings:\n", f);
for (i = 0; i < tagcnt; i++)
{
ep = bytag[i];
while (ep != NULL)
{
fprintf(f, " %s (%d-", ep->tag, ep->min);
if (ep->max != 0)
{
fprintf(f, "%d", ep->max);
}
fprintf(f, "): ansi color %s, %sSample Text",
color_ansi[(int) ep->color],
color_set(ep->color));
fprintf(f, "%s\n", color_set(0));
ep = ep->tagnext;
}
}
}
void
color_debug(FILE *f)
{
color_entry *ep;
int i;
printf("color debug dump\n");
ep = entries;
while (ep != NULL)
{
printf("%s(%d,%d): slot %d, ansi %s, %sSample Text",
ep->tag, ep->min, ep->max, ep->color, color_ansi[(int) ep->color],
color_set(ep->color));
printf("%s\n", color_set(0));
ep = ep->next;
}
printf("\ntags:");
for (i = 0; i < tagcnt; i++)
{
printf(" %s", bytag_names[i]);
}
printf("\n");
}
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