patch-2.2.15 linux/arch/s390/tools/silo/cfg.c

• Lines: 374
• Date: Fri Apr 21 12:45:48 2000
• Orig file: v2.2.14/arch/s390/tools/silo/cfg.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from ../../exclude v2.2.14/arch/s390/tools/silo/cfg.c linux/arch/s390/tools/silo/cfg.c
@@ -0,0 +1,373 @@
+/* cfg.c  -  Configuration file parser */
+
+/* Copyright 1992-1997 Werner Almesberger. See file COPYING for details. */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <string.h>
+
+#include "cfg.h"
+
+#define MAX_TOKEN 200
+#define MAX_VAR_NAME MAX_TOKEN
+
+static FILE *file;
+static char flag_set;
+static char *last_token = NULL,*last_item = NULL,*last_value = NULL;
+static int line_num;
+static char *file_name = NULL;
+static int back = 0; /* can go back by one char */
+
+
+void pdie(char *msg)
+{
+    fflush(stdout);
+    perror(msg);
+    exit(1);
+}
+
+
+void die(char *fmt,...)
+{
+    va_list ap;
+
+    fflush(stdout);
+    va_start(ap,fmt);
+    vfprintf(stderr,fmt,ap);
+    va_end(ap);
+    fputc('\n',stderr);
+    exit(1);
+}
+
+char *pstrdup(const char *str)
+{
+    char *this;
+
+    if ((this = strdup(str)) == NULL) pdie("Out of memory");
+    return this;
+}
+
+int cfg_open(char *name)
+{
+    if (!strcmp(name,"-")) file = stdin;
+    else if (!(file = fopen(file_name = name,"r"))) pdie(name);
+    line_num = 1;
+    return fileno(file);
+}
+
+void cfg_error(char *msg,...)
+{
+    va_list ap;
+
+    fflush(stdout);
+    va_start(ap,msg);
+    vfprintf(stderr,msg,ap);
+    va_end(ap);
+    if (!file_name) fputc('\n',stderr);
+    else fprintf(stderr," near line %d in file %s\n",line_num,file_name);
+    exit(1);
+}
+
+
+static int next_raw(void)
+{
+    int ch;
+
+    if (!back) return getc(file);
+    ch = back;
+    back = 0;
+    return ch;
+}
+
+
+static int next(void)
+{
+    static char *var;
+    char buffer[MAX_VAR_NAME+1];
+    int ch,braced;
+    char *put;
+
+    if (back) {
+	ch = back;
+	back = 0;
+	return ch;
+    }
+    if (var && *var) return *var++;
+    ch = getc(file);
+    if (ch == '\\') {
+	ch = getc(file);
+	if (ch == '$') return ch;
+	ungetc(ch,file);
+	return '\\';
+    }
+    if (ch != '$') return ch;
+    ch = getc(file);
+    braced = ch == '{';
+    put = buffer;
+    if (!braced) *put++ = ch;
+    while (1) {
+	ch = getc(file);
+#if 0
+	if (!braced && ch < ' ') {
+	    ungetc(ch,file);
+	    break;
+	}
+#endif
+	if (ch == EOF) cfg_error("EOF in variable name");
+	if (ch < ' ') cfg_error("control character in variable name");
+	if (braced && ch == '}') break;
+	if (!braced && !isalpha(ch) && !isdigit(ch) && ch != '_') {
+	    ungetc(ch,file);
+	    break;
+	}
+	if (put-buffer == MAX_VAR_NAME) cfg_error("variable name too long");
+	*put++ = ch;
+    }
+    *put = 0;
+    if (!(var = getenv(buffer))) cfg_error("unknown variable \"%s\"",buffer);
+    return next();
+}
+
+
+static void again(int ch)
+{
+    if (back) die("internal error: again invoked twice");
+    back = ch;
+}
+
+
+static char *cfg_get_token(void)
+{
+    char buf[MAX_TOKEN+1];
+    char *here;
+    int ch,escaped;
+
+    if (last_token) {
+	here = last_token;
+	last_token = NULL;
+	return here;
+    }
+    while (1) {
+	while ((ch = next()), ch == ' ' || ch == '\t' || ch == '\n')
+	    if (ch == '\n') line_num++;
+	if (ch == EOF) return NULL;
+	if (ch != '#') break;
+	while ((ch = next_raw()), ch != '\n')
+	    if (ch == EOF) return NULL;
+	line_num++;
+    }
+    if (ch == '=') return pstrdup("=");
+    if (ch == '"') {
+	here = buf;
+	while (here-buf < MAX_TOKEN) {
+	    if ((ch = next()) == EOF) cfg_error("EOF in quoted string");
+	    if (ch == '"') {
+		*here = 0;
+		return pstrdup(buf);
+	    }
+	    if (ch == '\\') {
+		ch = next();
+		if (ch != '"' && ch != '\\' && ch != '\n')
+		    cfg_error("Bad use of \\ in quoted string");
+		if (ch == '\n') {
+		    while ((ch = next()), ch == ' ' || ch == '\t');
+		    if (!ch) continue;
+		    again(ch);
+		    ch = ' ';
+		}
+	    }
+	    if (ch == '\n' || ch == '\t')
+		cfg_error("\\n and \\t are not allowed in quoted strings");
+	    *here++ = ch;
+	}
+	cfg_error("Quoted string is too long");
+	return 0; /* not reached */
+    }
+    here = buf;
+    escaped = 0;
+    while (here-buf < MAX_TOKEN) {
+	if (escaped) {
+	    if (ch == EOF) cfg_error("\\ precedes EOF");
+	    if (ch == '\n') line_num++;
+	    else *here++ = ch == '\t' ? ' ' : ch;
+	    escaped = 0;
+	}
+	else {
+	    if (ch == ' ' || ch == '\t' || ch == '\n' || ch == '#' ||
+	      ch == '=' || ch == EOF) {
+		again(ch);
+		*here = 0;
+		return pstrdup(buf);
+	    }
+	    if (!(escaped = (ch == '\\'))) *here++ = ch;
+	}
+	ch = next();
+    }
+    cfg_error("Token is too long");
+    return 0; /* not reached */
+}
+
+
+static void cfg_return_token(char *token)
+{
+    last_token = token;
+}
+
+
+static int cfg_next(char **item,char **value)
+{
+    char *this;
+
+    if (last_item) {
+	*item = last_item;
+	*value = last_value;
+	last_item = NULL;
+	return 1;
+    }
+    *value = NULL;
+    if (!(*item = cfg_get_token())) return 0;
+    if (!strcmp(*item,"=")) cfg_error("Syntax error");
+    if (!(this = cfg_get_token())) return 1;
+    if (strcmp(this,"=")) {
+	cfg_return_token(this);
+	return 1;
+    }
+    if (!(*value = cfg_get_token())) cfg_error("Value expected at EOF");
+    if (!strcmp(*value,"=")) cfg_error("Syntax error after %s",*item);
+    return 1;
+}
+
+
+static void cfg_return(char *item,char *value)
+{
+    last_item = item;
+    last_value = value;
+}
+
+
+void cfg_init(CONFIG *table)
+{
+    while (table->type != cft_end) {
+	switch (table->type) {
+	    case cft_strg:
+		if (table->data) free(table->data);
+	    case cft_flag:
+		table->data = NULL;
+		break;
+	    case cft_link:
+		table = ((CONFIG *) table->action)-1;
+		break;
+	    default:
+		die("Unknown syntax code %d",table->type);
+	}
+	table++;
+    }
+}
+
+
+static int cfg_do_set(CONFIG *table,char *item,char *value,int copy,
+    void *context)
+{
+    CONFIG *walk;
+
+    for (walk = table; walk->type != cft_end; walk++) {
+	if (walk->name && !strcasecmp(walk->name,item)) {
+	    if (value && walk->type != cft_strg)
+		cfg_error("'%s' doesn't have a value",walk->name);
+	    if (!value && walk->type == cft_strg)
+		cfg_error("Value expected for '%s'",walk->name);
+	    if (walk->data) {
+		if (walk->context == context)
+		    cfg_error("Duplicate entry '%s'",walk->name);
+		else {
+		    fprintf(stderr,"Ignoring entry '%s'\n",walk->name);
+		    if (!copy) free(value);
+		    return 1;
+		}
+	    }
+	    if (walk->type == cft_flag) walk->data = &flag_set;
+	    else if (walk->type == cft_strg) {
+		    if (copy) walk->data = pstrdup(value);
+		    else walk->data = value;
+	    }
+	    walk->context = context;
+	    if (walk->action) ((void (*)(void)) walk->action)();
+	    break;
+	}
+	if (walk->type == cft_link) walk = ((CONFIG *) walk->action)-1;
+    }
+    if (walk->type != cft_end) return 1;
+    cfg_return(item,value);
+    return 0;
+}
+
+
+void cfg_set(CONFIG *table,char *item,char *value,void *context)
+{
+    if (!cfg_do_set(table,item,value,1,context))
+	cfg_error("cfg_set: Can't set %s",item);
+}
+
+
+void cfg_unset(CONFIG *table,char *item)
+{
+    CONFIG *walk;
+
+    for (walk = table; walk->type != cft_end; walk++)
+	if (walk->name && !strcasecmp(walk->name,item)) {
+	    if (!walk->data) die("internal error (cfg_unset %s, unset)",item);
+	    if (walk->type == cft_strg) free(walk->data);
+	    walk->data = NULL;
+	    return;
+	}
+    die("internal error (cfg_unset %s, unknown",item);
+}
+
+
+int cfg_parse(CONFIG *table)
+{
+    char *item,*value;
+
+    while (1) {
+	if (!cfg_next(&item,&value)) return 0;
+	if (!cfg_do_set(table,item,value,0,table)) return 1;
+	free(item);
+    }
+}
+
+
+int cfg_get_flag(CONFIG *table,char *item)
+{
+    CONFIG *walk;
+
+    for (walk = table; walk->type != cft_end; walk++) {
+	if (walk->name && !strcasecmp(walk->name,item)) {
+	    if (walk->type != cft_flag)
+		die("cfg_get_flag: operating on non-flag %s",item);
+	    return !!walk->data;
+	}
+	if (walk->type == cft_link) walk = ((CONFIG *) walk->action)-1;
+    }
+    die("cfg_get_flag: unknown item %s",item);
+    return 0; /* not reached */
+}
+
+
+char *cfg_get_strg(CONFIG *table,char *item)
+{
+    CONFIG *walk;
+
+    for (walk = table; walk->type != cft_end; walk++) {
+	if (walk->name && !strcasecmp(walk->name,item)) {
+	    if (walk->type != cft_strg)
+		die("cfg_get_strg: operating on non-string %s",item);
+	    return walk->data;
+	}
+	if (walk->type == cft_link) walk = ((CONFIG *) walk->action)-1;
+    }
+    die("cfg_get_strg: unknown item %s",item);
+    return 0; /* not reached */
+}