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annotate ffstools/cal2text/dircheck.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 d41edd329670
children
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d41edd329670 fc-cal2text utility written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
d41edd329670 fc-cal2text utility written, compiles
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2 * Both arguments to fc-cal2text must name directories that already exist.
d41edd329670 fc-cal2text utility written, compiles
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3 * Here we implement the check for this requirement.
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4 */
d41edd329670 fc-cal2text utility written, compiles
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5
d41edd329670 fc-cal2text utility written, compiles
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6 #include <sys/types.h>
d41edd329670 fc-cal2text utility written, compiles
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7 #include <sys/stat.h>
d41edd329670 fc-cal2text utility written, compiles
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8 #include <stdio.h>
d41edd329670 fc-cal2text utility written, compiles
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9 #include <stdlib.h>
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10 #include <unistd.h>
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11
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12 check_directory_exists(pathname)
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13 char *pathname;
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14 {
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15 struct stat st;
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16
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17 if (stat(pathname, &st) < 0) {
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18 perror(pathname);
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19 exit(1);
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20 }
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21 if (!S_ISDIR(st.st_mode)) {
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22 fprintf(stderr, "error: %s is not a directory\n", pathname);
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23 exit(1);
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24 }
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25 return(0);
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26 }