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annotate librftab/rdcommon.c @ 965:2969032bdfac

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fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing The only 100% safe way to pass a NULL pointer as a function argument in K&R C is to cast 0 to a pointer type; failing to do so may cause mysterious bugs (invalid stack frames or garbage in argument registers) on 64-bit machines. This issue has already been fixed in most of FC host tools, but I just found some missed spots: passing of NULL UDH to PDU encoding functions in fcup-smsend[mult] in the case of single (not concatenated) SMS.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 01 Sep 2023 07:33:51 +0000
parents a0f79bba0ad8
children
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1 /*
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2 * This C file is not a compilation unit in itself, but is the common piece
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3 * (a set of static variables and functions) included in the librftab modules
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4 * responsible for reading different kinds of ASCII tables.
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5 */
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6
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7 #define MAX_FIELDS_PER_LINE 64
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8
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9 static char *filename;
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10 static FILE *rdfile;
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11 static unsigned lineno;
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12 static char linebuf[256], *line_fields[MAX_FIELDS_PER_LINE];
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13 static unsigned line_nfields, line_field_ptr;
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14
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15 static int
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16 read_line()
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17 {
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18 char *cp;
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19
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20 if (!fgets(linebuf, sizeof linebuf, rdfile))
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21 return(0);
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22 lineno++;
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23 cp = linebuf;
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24 for (line_nfields = 0; ; ) {
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25 while (isspace(*cp))
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26 cp++;
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27 if (*cp == '\0' || *cp == '#')
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28 break;
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29 if (line_nfields >= MAX_FIELDS_PER_LINE) {
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30 printf("%s line %d: too many fields on one line\n",
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31 filename, lineno);
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32 return(-1);
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33 }
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34 line_fields[line_nfields++] = cp;
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35 while (*cp && !isspace(*cp))
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36 cp++;
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37 if (*cp)
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38 *cp++ = '\0';
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39 }
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40 return(1);
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41 }
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42
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43 static
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44 get_field(retp)
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45 char **retp;
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46 {
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47 int rc;
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48
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49 if (line_field_ptr < line_nfields) {
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50 *retp = line_fields[line_field_ptr++];
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51 return(1);
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52 }
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53 do {
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54 rc = read_line();
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55 if (rc <= 0)
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56 return(rc);
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57 } while (!line_nfields);
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58 *retp = line_fields[0];
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59 line_field_ptr = 1;
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60 return(1);
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61 }