| 124 |
|
setambient(afile) /* initialize calculation */ |
| 125 |
|
char *afile; |
| 126 |
|
{ |
| 127 |
+ |
int readonly = 0; |
| 128 |
|
long pos, flen; |
| 129 |
|
AMBVAL amb; |
| 130 |
|
/* init ambient limits */ |
| 139 |
|
return; |
| 140 |
|
} |
| 141 |
|
/* open ambient file */ |
| 142 |
< |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 143 |
< |
initambfile(0); |
| 142 |
> |
if ((ambfp = fopen(afile, "r+")) == NULL) |
| 143 |
> |
readonly = (ambfp = fopen(afile, "r")) != NULL; |
| 144 |
> |
if (ambfp != NULL) { |
| 145 |
> |
initambfile(0); /* file exists */ |
| 146 |
|
pos = ftell(ambfp); |
| 147 |
|
while (readambval(&amb, ambfp)) |
| 148 |
|
avinsert(avstore(&amb)); |
| 149 |
< |
/* align */ |
| 149 |
> |
nambshare = nambvals; /* share loaded values */ |
| 150 |
> |
if (readonly) { |
| 151 |
> |
sprintf(errmsg, |
| 152 |
> |
"loaded %u values from read-only ambient file", |
| 153 |
> |
nambvals); |
| 154 |
> |
error(WARNING, errmsg); |
| 155 |
> |
fclose(ambfp); /* close file so no writes */ |
| 156 |
> |
ambfp = NULL; |
| 157 |
> |
return; /* avoid ambsync() */ |
| 158 |
> |
} |
| 159 |
> |
/* align file pointer */ |
| 160 |
|
pos += (long)nambvals*AMBVALSIZ; |
| 161 |
|
flen = lseek(fileno(ambfp), 0L, 2); |
| 162 |
|
if (flen != pos) { |
| 167 |
|
fseek(ambfp, pos, 0); |
| 168 |
|
ftruncate(fileno(ambfp), pos); |
| 169 |
|
} |
| 170 |
< |
nambshare = nambvals; |
| 171 |
< |
} else if ((ambfp = fopen(afile, "w+")) != NULL) |
| 172 |
< |
initambfile(1); |
| 160 |
< |
else { |
| 170 |
> |
} else if ((ambfp = fopen(afile, "w+")) != NULL) { |
| 171 |
> |
initambfile(1); /* else create new file */ |
| 172 |
> |
} else { |
| 173 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", afile); |
| 174 |
|
error(SYSTEM, errmsg); |
| 175 |
|
} |
