diff options
Diffstat (limited to 'g2/props.c')
| -rw-r--r-- | g2/props.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/g2/props.c b/g2/props.c new file mode 100644 index 00000000000..a23dc0504d2 --- /dev/null +++ b/g2/props.c @@ -0,0 +1,279 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 1997-2016 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include <stdio.h> +#include <ctype.h> +#include <malloc.h> +#include <time.h> +#include <gtk/gtk.h> +#include <string.h> + +static char *sxerox (char *s); +void exit(int); + +#define NBUCKETS 97 + +typedef struct prop_ { + struct prop_ *next; + char *name; + char *value; +} prop_t; + +static prop_t *buckets [NBUCKETS]; +static int hash_shifts[4] = {24, 16, 8, 0}; + +/* + * getprop + */ + +char *getprop (char *name) +{ + unsigned char *cp; + unsigned long hash=0; + prop_t *bp; + int i=0; + + for (cp = (unsigned char *) name; *cp; cp++) + hash ^= (*cp)<<(hash_shifts[(i++)&0x3]); + + bp = buckets [hash%NBUCKETS]; + + while (bp && strcmp (bp->name, name)) { + bp = bp->next; + } + + if (bp == NULL) + return (0); + else + return (bp->value); +} + +/* + * getprop_default + */ + +char *getprop_default (char *name, char *def) +{ + char *rv; + rv = getprop (name); + if (rv) + return (rv); + else + return (def); +} + +/* + * addprop + */ + +void addprop (char *name, char *value) +{ + unsigned char *cp; + unsigned long hash=0; + prop_t **bpp; + prop_t *bp; + int i=0; + + bp = (prop_t *)g_malloc (sizeof (prop_t)); + + bp->next = 0; + bp->name = sxerox (name); + bp->value = sxerox (value); + + for (cp = (unsigned char *)name; *cp; cp++) + hash ^= (*cp)<<(hash_shifts[(i++)&0x3]); + + bpp = &buckets [hash%NBUCKETS]; + + if (*bpp == NULL) + *bpp = bp; + else { + bp->next = *bpp; + *bpp = bp; + } +} + +/* + * sxerox + */ + +static char *sxerox (char *s) +{ + char *rv = (char *) g_malloc (strlen (s) + 1); + strcpy (rv, s); + return rv; +} + +/* + * readprops + */ + +#define START 0 +#define READNAME 1 +#define READVALUE 2 +#define C_COMMENT 3 +#define CPP_COMMENT 4 + +int readprops (char *filename) +{ + FILE *ifp; + unsigned char c; + int state=START; + int linenum=1; + char namebuf [128]; + char valbuf [512]; + int i; + + ifp = fopen (filename, "r"); + + if (ifp == NULL) + return (-1); + + while (1) { + + readchar: + c = getc (ifp); + + again: + switch (state) { + case START: + if (feof (ifp)) { + fclose (ifp); + return (0); + } + + if (c == ' ' || c == '\t') + goto readchar; + + if (c == '\n') { + linenum++; + goto readchar; + } + if (isalpha (c) || (c == '_')) { + state = READNAME; + goto again; + } + if (c == '/') { + c = getc (ifp); + if (c == '/') { + state = CPP_COMMENT; + goto readchar; + } else if (c == '*') { + state = C_COMMENT; + goto readchar; + } else { + fprintf (stderr, "unknown token '/' line %d\n", + linenum); + exit (1); + } + } + fprintf (stderr, "unknown token '%c' line %d\n", + c, linenum); + exit (1); + break; + + case CPP_COMMENT: + while (1) { + c = getc (ifp); + if (feof (ifp)) + return (0); + if (c == '\n') { + linenum++; + state = START; + goto readchar; + } + } + break; + + case C_COMMENT: + while (1) { + c = getc (ifp); + if (feof (ifp)) { + fprintf (stderr, "unterminated comment, line %d\n", + linenum); + exit (1); + } + if (c == '*') { + staragain: + c = getc (ifp); + if (c == '/') { + state = START; + goto readchar; + } + if (c == '*') + goto staragain; + } + } + break; + + case READNAME: + i = 0; + namebuf[i++] = c; + while (1) { + c = getc (ifp); + if (feof (ifp)) { + fprintf (stderr, "EOF while reading a name, line %d\n", + linenum); + exit (1); + } + if ((!isalnum (c)) && (c != '_')) { + namebuf [i] = 0; + state = READVALUE; + goto again; + } + namebuf [i++] = c; + } + break; + + case READVALUE: + i = 0; + while ((c == ' ') || (c == '\t') || (c == '=')) { + c = getc (ifp); + if (feof (ifp)) { + fprintf (stderr, "EOF while reading a value, line %d\n", + linenum); + exit (1); + } + } + goto firsttime; + while (1) { + c = getc (ifp); + + firsttime: + if (c == '\\') { + c = getc (ifp); + if (feof (ifp)) { + fprintf (stderr, "EOF after '\\', line %d\n", + linenum); + exit (1); + } + valbuf[i++] = c; + continue; + } + if (c == '\n') { + linenum++; + while (valbuf [i-1] == ' ' || valbuf[i-1] == '\t') + i--; + valbuf[i] = 0; + addprop (namebuf, valbuf); + state = START; + goto readchar; + } + valbuf[i++] = c; + } + + } + } +} |