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More refinements to the error handling

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Bobbi Webber-Manners 2020-06-26 19:30:06 -04:00
parent 60d910aacb
commit d263f86941
1 changed files with 29 additions and 11 deletions
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40
apps/email.c
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@ -22,7 +22,7 @@
#define EMAIL_C
#include "email_common.h"
#define MSGS_PER_PAGE 16 // Number of messages shown on summary screen
#define MSGS_PER_PAGE 18 // Number of messages shown on summary screen
#define MENU_ROW 22 // Row that the menu appears on
#define PROMPT_ROW 24 // Row that data entry prompt appears on
#define SCROLLBACK 25*80 // How many bytes to go back when paging up
@ -113,9 +113,11 @@ void free_headers_list(void) {
/*
* Read EMAIL.DB and populate linked list rooted at headers
* startnum - number of the first message to load (1 is the first)
* initialize - if set then total_new and total_msgs are calculated
* initialize - if 1, then total_new and total_msgs are calculated
* change - if 1, then errors are treated as non-fatal (for V)iew command)
* Returns 0 if okay, 1 on non-fatal error.
*/
void read_email_db(uint16_t startnum, uint8_t initialize) {
uint8_t read_email_db(uint16_t startnum, uint8_t initialize, uint8_t change) {
struct emailhdrs *curr = NULL, *prev = NULL;
uint16_t count = 0;
uint16_t l;
@ -126,10 +128,14 @@ void read_email_db(uint16_t startnum, uint8_t initialize) {
sprintf(filename, "%s/%s/EMAIL.DB", cfg_emaildir, curr_mbox);
fp = fopen(filename, "rb");
if (!fp) {
error(ERR_FATAL, "Can't open %s", filename);
error(change ? ERR_NONFATAL : ERR_FATAL, "Can't open %s", filename);
if (change)
return 1;
}
if (fseek(fp, (startnum - 1) * (sizeof(struct emailhdrs) - 2), SEEK_SET)) {
error(ERR_FATAL, "Can't seek in %s", filename);
error(change ? ERR_NONFATAL : ERR_FATAL, "Can't seek in %s", filename);
if (change)
return 1;
}
num_msgs = 0;
while (1) {
@ -140,7 +146,7 @@ void read_email_db(uint16_t startnum, uint8_t initialize) {
if (l != sizeof(struct emailhdrs) - 2) {
free(curr);
fclose(fp);
return;
return 0;
}
if (count <= MSGS_PER_PAGE) {
if (!prev)
@ -152,7 +158,7 @@ void read_email_db(uint16_t startnum, uint8_t initialize) {
} else
if (!initialize) {
fclose(fp);
return;
return 0;
}
if (initialize) {
++total_msgs;
@ -161,6 +167,7 @@ void read_email_db(uint16_t startnum, uint8_t initialize) {
}
}
fclose(fp);
return 0;
}
/*
@ -438,9 +445,16 @@ void new_mailbox(char *mbox) {
* Change current mailbox
*/
void change_mailbox(char *mbox) {
char prev_mbox[80];
uint8_t err;
strcpy(prev_mbox, curr_mbox);
strcpy(curr_mbox, mbox);
first_msg = 1;
read_email_db(first_msg, 1);
err = read_email_db(first_msg, 1, 1); // Errors non-fatal
if (err) {
strcpy(curr_mbox, prev_mbox);
return;
}
selection = 1;
email_summary();
}
@ -616,6 +630,7 @@ done:
*/
void keyboard_hdlr(void) {
struct emailhdrs *h;
uint8_t i;
while (1) {
char c = cgetc();
switch (c) {
@ -628,7 +643,7 @@ void keyboard_hdlr(void) {
update_highlighted();
} else if (first_msg > MSGS_PER_PAGE) {
first_msg -= MSGS_PER_PAGE;
read_email_db(first_msg, 0);
read_email_db(first_msg, 0, 0);
selection = num_msgs;
email_summary();
}
@ -642,7 +657,7 @@ void keyboard_hdlr(void) {
update_highlighted();
} else if (first_msg + selection + 1 < total_msgs) {
first_msg += MSGS_PER_PAGE;
read_email_db(first_msg, 0);
read_email_db(first_msg, 0, 0);
selection = 1;
email_summary();
}
@ -689,6 +704,9 @@ void keyboard_hdlr(void) {
break;
case 'a':
case 'A':
putchar(0x19); // HOME
for (i = 0; i < PROMPT_ROW - 1; ++i)
putchar(0x0a); // CURSOR DOWN
copy_to_mailbox("RECEIVED", 1);
break;
case 'p':
@ -722,7 +740,7 @@ void main(void) {
videomode(VIDEOMODE_80COL);
readconfigfile();
first_msg = 1;
read_email_db(first_msg, 1);
read_email_db(first_msg, 1, 0);
selection = 1;
email_summary();
keyboard_hdlr();