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Add error control to iofile

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write can write less bytes than we request, so it is necessary check the
return value, in case of error print a message and don't continnue writing
in the file.
---
 st.c |   39 ++++++++++++++++++++++++++++++---------
 1 file changed, 30 insertions(+), 9 deletions(-)
This commit is contained in:
Roberto E. Vargas Caballero
2012-10-28 06:27:42 +01:00
parent 2e38ab7afd
commit ee3fbeb6c8
1 changed files with 30 additions and 9 deletions
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35
st.c
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@ -340,6 +340,7 @@ static int utf8encode(long *, char *);
static int utf8size(char *);
static int isfullutf8(char *, int);
static ssize_t xwrite(int, char *, size_t);
static void *xmalloc(size_t);
static void *xrealloc(void *, size_t);
static void *xcalloc(size_t nmemb, size_t size);
@ -379,6 +380,21 @@ static char *opt_embed = NULL;
static char *opt_class = NULL;
static char *opt_font = NULL;
ssize_t
xwrite(int fd, char *s, size_t len) {
size_t aux = len;
while(len > 0) {
ssize_t r = write(fd, s, len);
if(r < 0)
return r;
len -= r;
s += r;
}
return aux;
}
void *
xmalloc(size_t len) {
void *p = malloc(len);
@ -926,16 +942,15 @@ ttynew(void) {
cmdfd = m;
signal(SIGCHLD, sigchld);
if(opt_io) {
if(!strcmp(opt_io, "-")) {
iofd = STDOUT_FILENO;
} else {
if((iofd = open(opt_io, O_WRONLY | O_CREAT, 0666)) < 0) {
iofd = (!strcmp(opt_io, "-")) ?
STDOUT_FILENO :
open(opt_io, O_WRONLY | O_CREAT, 0666);
if(iofd < 0) {
fprintf(stderr, "Error opening %s:%s\n",
opt_io, strerror(errno));
}
}
}
}
}
void
@ -1793,8 +1808,14 @@ tputc(char *c, int len) {
uchar ascii = *c;
bool control = ascii < '\x20' || ascii == 0177;
if(iofd != -1)
write(iofd, c, len);
if(iofd != -1) {
if (xwrite(iofd, c, len) < 0) {
fprintf(stderr, "Error writting in %s:%s\n",
opt_io, strerror(errno));
close(iofd);
iofd = -1;
}
}
/*
* STR sequences must be checked before of anything
* because it can use some control codes as part of the sequence