popt/poptconfig.c

   1 /** \ingroup popt
   2  * \file popt/poptconfig.c
   3  */
   4
   5 /* (C) 1998-2002 Red Hat, Inc. -- Licensing details are in the COPYING
   6    file accompanying popt source distributions, available from
   7    ftp://ftp.rpm.org/pub/rpm/dist. */
   8
   9 #include "system.h"
  10 #include "poptint.h"
  11 /*@access poptContext @*/
  12
  13 /*@-compmempass@*/      /* FIX: item->option.longName kept, not dependent. */
  14 static void configLine(poptContext con, char * line)
  15         /*@modifies con @*/
  16 {
  17     size_t nameLength;
  18     const char * entryType;
  19     const char * opt;
  20     poptItem item = (poptItem) alloca(sizeof(*item));
  21     int i, j;
  22
  23     if (con->appName == NULL)
  24         return;
  25     nameLength = strlen(con->appName);
  26
  27 /*@-boundswrite@*/
  28     memset(item, 0, sizeof(*item));
  29
  30     if (strncmp(line, con->appName, nameLength)) return;
  31
  32     line += nameLength;
  33     if (*line == '\0' || !isSpace(line)) return;
  34
  35     while (*line != '\0' && isSpace(line)) line++;
  36     entryType = line;
  37     while (*line == '\0' || !isSpace(line)) line++;
  38     *line++ = '\0';
  39
  40     while (*line != '\0' && isSpace(line)) line++;
  41     if (*line == '\0') return;
  42     opt = line;
  43     while (*line == '\0' || !isSpace(line)) line++;
  44     *line++ = '\0';
  45
  46     while (*line != '\0' && isSpace(line)) line++;
  47     if (*line == '\0') return;
  48
  49     /*@-temptrans@*/ /* FIX: line alias is saved */
  50     if (opt[0] == '-' && opt[1] == '-')
  51         item->option.longName = opt + 2;
  52     else if (opt[0] == '-' && opt[2] == '\0')
  53         item->option.shortName = opt[1];
  54     /*@=temptrans@*/
  55
  56     if (poptParseArgvString(line, &item->argc, &item->argv)) return;
  57
  58     /*@-modobserver@*/
  59     item->option.argInfo = POPT_ARGFLAG_DOC_HIDDEN;
  60     for (i = 0, j = 0; i < item->argc; i++, j++) {
  61         const char * f;
  62         if (!strncmp(item->argv[i], "--POPTdesc=", sizeof("--POPTdesc=")-1)) {
  63             f = item->argv[i] + sizeof("--POPTdesc=");
  64             if (f[0] == '$' && f[1] == '"') f++;
  65             item->option.descrip = f;
  66             item->option.argInfo &= ~POPT_ARGFLAG_DOC_HIDDEN;
  67             j--;
  68         } else
  69         if (!strncmp(item->argv[i], "--POPTargs=", sizeof("--POPTargs=")-1)) {
  70             f = item->argv[i] + sizeof("--POPTargs=");
  71             if (f[0] == '$' && f[1] == '"') f++;
  72             item->option.argDescrip = f;
  73             item->option.argInfo &= ~POPT_ARGFLAG_DOC_HIDDEN;
  74             item->option.argInfo |= POPT_ARG_STRING;
  75             j--;
  76         } else
  77         if (j != i)
  78             item->argv[j] = item->argv[i];
  79     }
  80     if (j != i) {
  81         item->argv[j] = NULL;
  82         item->argc = j;
  83     }
  84     /*@=modobserver@*/
  85 /*@=boundswrite@*/
  86
  87     /*@-nullstate@*/ /* FIX: item->argv[] may be NULL */
  88     if (!strcmp(entryType, "alias"))
  89         (void) poptAddItem(con, item, 0);
  90     else if (!strcmp(entryType, "exec"))
  91         (void) poptAddItem(con, item, 1);
  92     /*@=nullstate@*/
  93 }
  94 /*@=compmempass@*/
  95
  96 int poptReadConfigFile(poptContext con, const char * fn)
  97 {
  98     const char * file, * chptr, * end;
  99     char * buf;
 100 /*@dependent@*/ char * dst;
 101     int fd, rc;
 102     off_t fileLength;
 103
 104     fd = open(fn, O_RDONLY);
 105     if (fd < 0)
 106         return (errno == ENOENT ? 0 : POPT_ERROR_ERRNO);
 107
 108     fileLength = lseek(fd, 0, SEEK_END);
 109     if (fileLength == -1 || lseek(fd, 0, 0) == -1) {
 110         rc = errno;
 111         (void) close(fd);
 112         errno = rc;
 113         return POPT_ERROR_ERRNO;
 114     }
 115
 116     file = alloca(fileLength + 1);
 117     if (read(fd, (char *)file, fileLength) != fileLength) {
 118         rc = errno;
 119         (void) close(fd);
 120         errno = rc;
 121         return POPT_ERROR_ERRNO;
 122     }
 123     if (close(fd) == -1)
 124         return POPT_ERROR_ERRNO;
 125
 126 /*@-boundswrite@*/
 127     dst = buf = alloca(fileLength + 1);
 128
 129     chptr = file;
 130     end = (file + fileLength);
 131     /*@-infloops@*/     /* LCL: can't detect chptr++ */
 132     while (chptr < end) {
 133         switch (*chptr) {
 134           case '\n':
 135             *dst = '\0';
 136             dst = buf;
 137             while (*dst && isSpace(dst)) dst++;
 138             if (*dst && *dst != '#')
 139                 configLine(con, dst);
 140             chptr++;
 141             /*@switchbreak@*/ break;
 142           case '\\':
 143             *dst++ = *chptr++;
 144             if (chptr < end) {
 145                 if (*chptr == '\n')
 146                     dst--, chptr++;
 147                     /* \ at the end of a line does not insert a \n */
 148                 else
 149                     *dst++ = *chptr++;
 150             }
 151             /*@switchbreak@*/ break;
 152           default:
 153             *dst++ = *chptr++;
 154             /*@switchbreak@*/ break;
 155         }
 156     }
 157     /*@=infloops@*/
 158 /*@=boundswrite@*/
 159
 160     return 0;
 161 }
 162
 163 int poptReadDefaultConfig(poptContext con, /*@unused@*/ UNUSED(int useEnv))
 164 {
 165     char * fn, * home;
 166     int rc;
 167
 168     if (con->appName == NULL) return 0;
 169
 170     rc = poptReadConfigFile(con, "/etc/popt");
 171     if (rc) return rc;
 172
 173     if ((home = getenv("HOME"))) {
 174         size_t bufsize = strlen(home) + 20;
 175         fn = alloca(bufsize);
 176         if (fn == NULL) return 0;
 177         snprintf(fn, bufsize, "%s/.popt", home);
 178         rc = poptReadConfigFile(con, fn);
 179         if (rc) return rc;
 180     }
 181
 182     return 0;
 183 }